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A greenhouse is not a finished product when it arrives. The structure — frame, panels, door, vents — is the foundation. What you add to it determines how productive, how manageable, and how much of the year it remains genuinely useful.
Some accessories are genuinely transformative. Some are useful additions that compound in value over time. Some are comfort items that make time in the greenhouse more enjoyable. This guide ranks them honestly, from the accessories that make the biggest difference to growing outcomes down to the ones that are worth having once the essentials are covered.
Every product in this guide is available for KLASIKA and BALTIC LT greenhouses from the same retailer you purchased your greenhouse from. The accessories are designed and sized to work with this range specifically — not generic products that may or may not fit.
The order matters. If you are equipping a new greenhouse, work down this list in sequence. The early items on it have a greater impact on growing success than everything after them combined.
Impact: Essential. The single most important greenhouse accessory.
No other addition to a greenhouse has a greater effect on growing outcomes than automatic vent openers — and no other accessory is as consistently underestimated by first-time buyers until they experience a season without them.
Here is why they matter so much. An enclosed polycarbonate greenhouse in direct summer sun can reach 45–50°C within an hour of the sun appearing over the roof. At these temperatures, plants do not just grow slowly — they wilt, scorch, and in severe cases suffer permanent damage within a morning. The difference between a well-ventilated greenhouse at a manageable 25–28°C and an unventilated one at 45°C is not a matter of degree — it is the difference between a productive growing environment and a plant-killing one.
Manual vent management — opening vents in the morning, closing them in the afternoon — requires constant attention through the April-to-September growing season. A sunny morning can become an overcast afternoon in an hour, and the greenhouse that was dangerously hot at 10am needs its vents closing again by noon. The gardener who is away for the day, or who simply has other demands on their time, will miss these transitions. Plants will suffer.
Automatic wax-cylinder vent openers solve this problem entirely, passively, and without electricity.
The operating mechanism is elegantly simple. A cylinder of wax is sealed inside the opener unit. As greenhouse temperature rises, the wax expands — pushing a piston outward, which opens the vent. As temperature falls, the wax contracts, the piston retracts, and the vent closes. No thermostat, no wiring, no batteries, no programming. The opener responds directly and continuously to the temperature at the vent location — the most accurate sensing point possible.
The opening and closing is progressive — the vent opens more as it gets hotter, partially at moderate temperatures and fully in peak heat. This graduated response is more effective than a simple on/off thermostat at maintaining consistent internal temperatures across the variable conditions of a UK growing day.
Three automatic opener models are available for KLASIKA and BALTIC LT greenhouses, all manufactured in Denmark by Orbesen Teknik ApS — a company that has specialised in greenhouse ventilation systems for decades. The Danish manufacturing origin is relevant: these products are engineered for Northern European climate conditions, designed for the specific temperature ranges and weather patterns of the UK growing season.
THERMOVENT is the established classic in the range — a proven model used widely across professional and hobby greenhouse applications. It opens progressively from approximately 17°C and reaches full opening at around 25°C, operating through a temperature range that suits the UK growing season precisely.
VENTOMAX operates on the same wax-cylinder principle with a slightly different opening profile — suited to applications where a more gradual opening response is preferred, or where the vent position means a more sensitive opening range is appropriate.
UNIVENT is designed for universal application — the UNIVENT fitting system allows it to be used with a wider range of vent configurations and opening geometries than the model-specific variants, making it appropriate where the vent geometry requires more flexibility in the opener attachment.
All three are sold by greenhouse model — the fit of the opener to the vent frame is specific to each model in the KLASIKA and BALTIC LT range, ensuring correct operation and secure attachment without modification.
How many to fit: Every roof vent. The cost of an automatic opener is modest; the value of having every vent operating passively throughout the season is substantial. The opening profile of an individual vent opener is calibrated to that vent’s position — fitting all vents gives the greenhouse its full designed ventilation capacity rather than managing temperature through only the manually-operated fraction.
Impact: High. Doubles the effective growing space without increasing the footprint.
A polycarbonate greenhouse has two growing dimensions that most owners use — the beds along the sides and the floor area. It has a third dimension — the height — that hanging shelves unlock.
The hanging shelves available for KLASIKA and BALTIC LT greenhouses are 45cm wide, available in three lengths: 75cm, 105cm, and 200cm. They hang from the greenhouse frame — suspended from the arch sections or horizontal frame members at whatever height suits the intended use — and provide a staging level above the main bed or floor area below.
This suspended staging layer is where some of the most valuable greenhouse tasks happen: propagation trays of emerging seedlings, small pots waiting to be potted on, herbs growing in containers, plants that need good air circulation around them, and crops that do not need full-bed space. A 200cm hanging shelf along one end wall of a 3m × 6m greenhouse creates a full propagation and potting bench at working height, freeing the beds below it for growing crops.
The galvanised steel frame of a KLASIKA or BALTIC LT greenhouse is specifically strong enough to carry the load of hanging shelves loaded with pots, trays, and growing media. This is not a minor point — not all greenhouse frames are. An aluminium frame at lighter gauge cross-section will flex at the fixing point of a heavily loaded shelf over time; the CE-certified omega-profile or square-tube steel frame of this range holds the fixing firmly throughout years of service.
The hanging shelf attachment hardware is designed for the specific frame dimensions of the KLASIKA range, ensuring that the load is distributed correctly across the arch section and that the shelf hangs level and stable.
Propagation staging: The shelf height is set at comfortable working height for a seated or standing position, with trays of seedlings on the shelf and watering access easy from below. A south-facing end wall of the greenhouse — typically the end with the door — is often the best light position for propagation staging.
Potted herb growing: A hanging shelf at mid-height on the south-facing side of the greenhouse provides an ideal growing position for basil, coriander, parsley, and other herbs that need warmth and good light but do not need the bed depth of larger plants.
Overwintering: Small pots of tender cuttings — pelargoniums, fuchsias, begonias taken in late summer — occupy minimal floor space when stacked on shelving. A 105cm shelf at a comfortable height holds dozens of small pots that would otherwise take up bed or staging space.
Length selection: The 75cm shelf suits targeted applications — a specific corner or end position where a short run of staging is needed. The 105cm shelf is the most versatile for mid-length staging applications. The 200cm shelf is the choice for a full-length propagation or staging run — particularly useful in greenhouses of 6m and above where one end can be dedicated entirely to staging and propagation, with the 200cm shelf providing the working surface.
Impact: High. Transforms the growing environment from open ground to managed beds.
The difference between growing in open ground inside a greenhouse and growing in raised seedbed sets is the difference between a field and a kitchen garden. Both produce crops; only one is organised, manageable, and optimal in the conditions it creates.
Raised seedbed sets for KLASIKA and BALTIC LT greenhouses are designed and dimensioned to fit the internal widths of the range precisely:
For 3m-wide greenhouses (KLASIKA ARCHED, BALTIC LT, KLASIKA TUBE, KLASIKA EASY): the seedbed sets fit the 3m internal width perfectly, sitting on each side of the central path with no wasted space and no awkward trimming to fit around frame elements.
For 2.35m and 2.5m-wide greenhouses (KLASIKA HOUSE, KLASIKA BERNARD, STANDART KLASIKA, KLASIKA DROP): equivalent sets are sized for the narrower widths with the same precision.
The sets are available at heights of 10cm and 20cm — the 10cm height suits shallow-rooted crops and is the standard choice for most greenhouse growing; the 20cm height provides more root depth for crops with larger root systems and better drainage characteristics for particularly wet sites.
Soil warming. The sides of a raised seedbed retain heat, and the raised structure means the soil mass within it warms faster in spring than open ground. Soil temperature is one of the most important early-season variables — root uptake of water and nutrients is inhibited below 10°C, and many seeds will not germinate below this threshold. A raised seedbed in a polycarbonate greenhouse can be at 12–14°C when outdoor ground temperatures are still at 6–8°C.
Defined growing zones. The bed edge creates a clear boundary between growing area and path. Soil stays in the bed; the path stays accessible. The beds can be managed intensively — composted, amended, planted at high density — without the soil management affecting the working path alongside.
Weed suppression. A raised seedbed with defined edges has no sloping soil sides to weed — the vertical edge eliminates the margin where weeds establish most easily in open beds. Less weeding inside the greenhouse means more time growing.
Certified construction. The metal raised seedbed sets in the KLASIKA range carry CE marking certification — the same independently verified quality standard that covers the greenhouse frames. This is not a coincidence: both products are manufactured by Meistro Kodas UAB in Lithuania to consistent material and manufacturing standards.
The nursery/seedbed with polycarbonate cover (100×93×38cm, covered with 4mm polycarbonate) occupies a distinct role in the accessories range — it is not a growing bed but a propagation microclimate.
Used inside a polycarbonate greenhouse, the nursery/seedbed creates a double-insulated environment: the greenhouse panels hold warmth around the seedbed, and the polycarbonate cover holds additional warmth around the germinating seeds. In practice, this means seeds sown in an unheated greenhouse in January or February — where overnight temperatures might drop to 4°C — germinate in conditions several degrees warmer than the surrounding greenhouse air, without any electrical heating.
The cover lifts for ventilation and watering, then replaces to retain the accumulated warmth. The seedbed itself is 38cm deep — enough for root trainers, seed trays, and small pots of all standard types. When seed starting is complete for the season, the nursery/seedbed functions as a compact cold frame for hardening-off seedlings or as a dedicated propagation bay for successive batches of cuttings.
Impact: High for growing climbing and trained crops — essential if tomatoes and cucumbers are on your growing list.
Plant binding sets provide the support infrastructure that turns a greenhouse into a fully functional growing space for climbing and trained crops. They are ordered by greenhouse length — each set covers the full length of the greenhouse with the appropriate number of attachment points and support elements for training plants vertically up the frame.
This is where the material specification of your greenhouse directly determines what is possible.
The CE-certified galvanised steel frame of a KLASIKA or BALTIC LT greenhouse is strong enough to anchor plant binding sets to the arch sections and ridge bar without any concern about progressive deformation at the fixing point, loosening of the connection, or load transfer to adjacent frame members under the weight of a full season’s crop growth.
A cordon tomato plant at peak production — fully leafed, with four or five trusses of developing fruit and a leading stem at 1.8–2m — is carrying significant weight. Multiply this by eight, twelve, or sixteen plants down the length of a 3m greenhouse and the cumulative load on the binding strings and their attachment points to the ridge is substantial. Steel handles this. The frame that is strong enough to tie plants to is a material quality choice that has direct growing consequences.
Plant binding sets for the KLASIKA range include the horizontal support wires or rods that run between arch sections at appropriate heights, the vertical string or clip attachments that each plant is trained up, and the end fixings that anchor the system to the frame at both ends of the greenhouse.
They are ordered by greenhouse length — a binding set for a 4m greenhouse, a 6m greenhouse, and so on — ensuring that the correct number of attachment points and the correct length of support elements are provided for the specific greenhouse. A set ordered to the greenhouse length requires no cutting, fitting, or adaptation: it goes in, the plants go up.
Impact: High in season. Transforms daily watering from a task into an automated function.
A productive greenhouse in June and July requires watering that is daily, sometimes twice-daily for cucumbers and tomatoes in hot conditions, and precisely calibrated — too dry stresses the plants and causes blossom end rot in tomatoes; too wet encourages root disease. Getting this right manually is achievable but demanding, particularly during holiday periods or hot spells where the watering requirement changes quickly.
Two irrigation system types are available for KLASIKA and BALTIC LT greenhouses:
Capillary systems deliver water through a permeable mat or wick system that is in direct contact with the growing medium. Water moves upward through capillary action from the water supply into the pot or growing medium, maintaining consistent moisture levels without individual dripper points per plant. Capillary systems are particularly suited to propagation trays and pot plants where the growing medium volume is small and moisture consistency is critical for germination and early root development.
Drip systems deliver water directly to the root zone of each individual plant through a small-bore dripper nozzle on a supply line running along the bed. Each plant receives its own precisely positioned water supply, and the system can be set to deliver a fixed amount at fixed intervals — manually operated or connected to a simple timer.
Drip irrigation is the system for tomatoes, cucumbers, peppers, and aubergines grown in the main greenhouse beds. The direct root-zone delivery means no water is lost to evaporation from the bed surface, no foliage is wetted (which reduces botrytis risk), and each plant receives a consistent water supply regardless of which plants are larger or more vigorous. The improvement in crop uniformity that good irrigation consistency produces is measurable in yield.
Both systems are available for connection to the mains water supply or to a gravity-fed supply from a water tank. A gravity-fed system using a water tank positioned to give a working head of water is the more self-contained option — particularly useful for gardens where a mains connection to the greenhouse is inconvenient or for gardeners who prefer to use collected rainwater for irrigation.
Impact: Moderate to high, depending on water source preference and irrigation system choice.
A water tank positioned to collect rainwater from the greenhouse roof guttering provides a free and sustainable irrigation water source throughout the growing season. Collected rainwater is softer than mains water in most UK regions — meaning less mineral deposit build-up on polycarbonate panels and growing media, and better uptake of certain nutrients for acid-preferring crops.
The practical mechanics: the greenhouse guttering — included with models that have foundation skirts, available as an accessory for others — channels rainwater from the roof into a downpipe. The downpipe connects to the water tank inlet, filling the tank during rain events. An outlet connection at the base of the tank supplies the irrigation system by gravity, or a simple hand pump allows watering directly from the tank.
Water tanks are available in multiple capacities and designs. Key considerations:
Capacity: A 200-litre tank provides a few days’ irrigation supply for a full greenhouse in dry summer conditions; a 500-litre or larger tank extends this to a week or more. For large greenhouses with significant crop counts, a larger tank reduces the frequency of reliance on mains top-up.
Position: The tank should sit close enough to the greenhouse downpipe to connect easily, and high enough to give working head pressure for a gravity-fed system — even 30cm of height above the bed level produces usable gravity pressure for drip emitters. Some designs include an integral stand; others require a stable base to elevate them.
Aesthetics: Tanks are available in green, brown, and black to suit different garden settings. Darker colours reduce algae growth inside the tank by limiting light transmission into the stored water.
Impact: Moderate — highly significant in hot summers, less relevant in cool ones.
The greenhouse shading solution is a liquid product applied to the exterior surface of the polycarbonate panels in early summer and washed off in autumn. When dry, it forms a light, translucent coating that reduces solar gain — the total heat energy entering the greenhouse through the panels — without blocking all available light.
The shading solution is the passive thermal management tool for summer conditions that cannot be addressed by ventilation alone. On a bright, hot July day when outdoor temperature is 28°C and direct sun is striking the south-facing panels, no amount of ventilation will prevent the greenhouse reaching damaging temperatures without reducing the solar input at the panel surface. The shading solution reduces this input before it enters the greenhouse — the most efficient point of control.
Application: Dilute according to the product instructions, apply to the exterior of the panels by brush or garden sprayer working along the panel runs, allow to dry. The coating is water-resistant once dry — light rain will not remove it — but washes off cleanly in autumn with a standard panel wash.
When to apply: From late May or early June, when consistently warm and sunny conditions begin. Earlier application on cold, overcast days reduces the light available to early-season crops unnecessarily. The timing is responsive to actual weather rather than fixed on a calendar date.
Compatibility: The shading solution is specifically formulated for use on polycarbonate, glass, and film surfaces and does not damage the UV-protective layer in Brett Martin panels.
When not to use it: In a cool, cloudy summer, the shading solution may restrict more light than is beneficial. The answer is to assess real conditions rather than applying automatically. If the greenhouse is not overheating — if temperatures are consistently below 28°C and ventilation is keeping the environment comfortable — the shading solution can wait or be omitted for the season.
Impact: Moderate ongoing, high at seasonal transitions.
Two cleaning products complete the maintenance product range for KLASIKA and BALTIC LT greenhouses:
The disinfection product is the seasonal deep-clean essential — applied at the autumn close-down and spring reopening to remove the disease inoculum that accumulates on frame surfaces, bed edges, staging, and panel inner faces during the growing season.
Botrytis spores, fusarium residues, bacterial canker inoculum — these pathogens persist on greenhouse surfaces from one season to the next and infect newly planted crops at the beginning of the following season. A thorough annual disinfection with a concentrated broad-spectrum solution removes this reservoir and starts each season from a clean slate.
Dilute according to the instructions, apply to all internal surfaces after clearing all plant material, allow the specified contact time, and rinse thoroughly. The greenhouse should then be ventilated fully before any new plants are introduced.
The concentrated format means a single purchase covers multiple applications — dilution ratios are generous and a standard bottle treats a 3m × 8m greenhouse several times over at the recommended working concentration.
The universal surface cleaner handles the external maintenance tasks — panel cleaning, frame washing, guttering, and any organic growth removal from surfaces around the greenhouse.
Its broad formulation makes it useful beyond the greenhouse specifically: the same product cleans paving around the greenhouse, fencing adjacent to it, canopies, outdoor furniture, and other garden structures. For greenhouse panels, it removes the algae, mineral deposits, and surface deposits that a simple soap-and-water wash cannot fully address, maintaining light transmission at its designed level throughout the service life of the panels.
| Priority | Accessory | Impact | Who needs it |
|---|---|---|---|
| 1 | Automatic vent openers (THERMOVENT / VENTOMAX / UNIVENT) | Essential | Every greenhouse, every grower |
| 2 | Hanging shelves (75/105/200cm) | High | Any grower wanting to maximise growing space |
| 3 | Raised seedbed sets (matched to greenhouse width) | High | Any grower wanting managed, productive beds |
| 3a | Nursery/seedbed with polycarbonate cover | High | Year-round growers, early propagators |
| 4 | Plant binding sets | High for climbing crops | Tomato and cucumber growers |
| 5 | Drip or capillary irrigation | High in season | Active-season growers, holiday periods |
| 6 | Water tanks | Moderate–high | Rainwater collectors, irrigation system users |
| 7 | Greenhouse shading solution | Moderate | Hot summer management |
| 8 | Disinfection and surface cleaner | Moderate ongoing | All owners, seasonal maintenance |
Every accessory in this guide is designed to work with specific KLASIKA and BALTIC LT models. Vent openers are sold by greenhouse model — the fit is specific to each vent frame geometry. Plant binding sets are ordered by greenhouse length. Raised seedbed sets are dimensioned to the internal widths of the range.
When ordering, have your greenhouse model and length to hand. This ensures you receive the correctly specified product for your greenhouse rather than a generic item that may require adaptation. Your retailer can confirm the right specification for each accessory if you are unsure.
The accessories in this guide are not afterthoughts. They are the products that close the gap between a greenhouse that is assembled and a greenhouse that is performing. The automatic vent openers prevent the temperature crises that cost crops; the raised beds create the growing environment that produces the yields; the irrigation system provides the consistency that uniform fruit development requires. Buy the greenhouse and fit these alongside it from the first season — the return on that investment arrives immediately and continues for every season after.
Our team is here to help you find the perfect growing solution.
