Grow Racks
Grow racks stack ebb and flow trays in tiers, multiplying your growing canopy without using more floor space. Hydroponics UK stocks 11 G-Tools grow racks and height-extension sets, from a 1.1 x 0.63 m frame at £369 to a two-tray 2 x 1 m vertical farming rack at £721. Each rack houses a 62 to 150-litre nutrient tank below the lowest tier. Gravity returns the solution after every timed flood, so no sump pump is needed.
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Vertical Grow Racks for Higher Yield in the Same Floor Space
A grow rack turns wasted ceiling height into productive growing area. Instead of spreading trays across a wide bench, you stack them in tiers above a single footprint. Every rack we stock is built by G-Tools around ebb and flow trays. A pump lifts nutrient solution from a tank below the lowest tier on a timer. Gravity drains it back down when the pump stops. That closed loop keeps water use tight and removes the need for a separate floor drain.
Size the rack to your trays first. The tray footprint sets the canopy area per tier. The tank below sets how long a system runs between refills. A 1.1 x 0.63 m rack pairs with a 62-litre tank for compact propagation. The larger 2 x 1 m frame sits over a 150-litre reservoir for serious microgreen or leafy-crop output. Start with one or two tiers, then bolt on extra levels as your production grows. You never replace the base frame.
The G-Tools Grow Rack Range Explained
Each rack is named by its tray size. Smaller frames suit cabinets and tight corners; larger frames suit dedicated grow rooms. The table below compares the four most popular racks we stock, including single-tray and two-tray vertical farming layouts.
| Model | Type | Best for | Key spec | Price |
|---|---|---|---|---|
| Grow Rack 1.1 x 0.63 m | Compact tiered | Propagation, small cabinets | 62-litre tank space, expandable tiers | £369 |
| Grow Rack 1.1 x 1 m (Matt's Pick) | Mid-size tiered | Microgreens, baby leaf | 2.2 m² canopy per tier, 62-litre tank | £409 |
| Grow Rack 2 x 0.8 m | Two-tier vertical | Herbs, larger crops | 150-litre reservoir bay | £702 |
| Grow Rack 2 x 1 m Two-Tray | Multi-layer vertical | Commercial microgreens | Two 2 x 1 m trays, 150-litre tank | £721 |
Matt's Pick: Grow Rack 1.1 x 1 m
Best for: microgreen and baby-leaf production at home
Why we rate it: two 1.1 x 1 m trays per tier give 2.2 m² of canopy, the 62-litre tank fits neatly underneath, and you add tiers later without touching the base frame.
Price: £409
How to Size and Set Up a Vertical Grow Rack
Measure your ceiling height before you choose a tier count. Allow clearance above each tray for the canopy plus the lamp. Sanlight Flex II 20 W bars are slim, so they fit between tiers without stealing headroom. Run three to five bars per tier on smaller racks. Step up to six to ten on the 2 x 1 m frame. Match the bar count to your crop's light demand rather than guessing.
Plumbing is simple with these racks. Sit the tank below the lowest tier and fit a pump on a timer. Then connect the feed line up to each tray. When the pump runs, the trays flood; when it stops, gravity drains them. A G-Tools irrigation kit feeds up to three tiers from one reservoir. Buy height-extension sets matched to your tray size so the frame stays square as you scale upward.
The mistake I see most is uneven flood timing across tiers. Upper trays drain faster than lower ones, so set the timer by root-zone moisture, not by the clock. Start with short flood intervals and extend them gradually. Keep the reservoir topped up too. A 150-litre tank can drop a long way across several daily cycles. A low tank then concentrates the nutrient mix and stresses young microgreens fast.
- Matt W, Hydroponics UK
Frequently asked questions
A grow rack stacks ebb and flow trays in tiers above one footprint. It multiplies your growing canopy by using ceiling height instead of more floor space. Each tier holds trays fed from a tank below.
Match the rack to your tray size and ceiling height. Smaller 1.1 x 0.63 m racks suit cabinets and propagation. The 2 x 1 m frame suits dedicated grow rooms and larger crops.
Yes, every rack accepts height-extension sets matched to its tray size. You bolt extra tiers onto the base frame without replacing it. Buy the extension set sized to your existing rack.
You need one feed pump on a timer, but no sump pump. The pump floods the trays, then gravity drains the solution back to the tank below the lowest tier.
Each rack is sized to accept Sanlight Flex II 20 W bars per tier. Run three to five bars on smaller racks. Use six to ten bars on the 2 x 1 m frame.
Tank space ranges from 62 litres on the 1.1 m racks to 150 litres on the 2 m frames. The reservoir sits under the lowest tier and feeds every tray above it.
Build out the rest of your system to match your new rack. Pair it with ebb and flow trays, grow lights and a microgreens kit for fast, repeatable harvests.