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Tomato greenhouse for a grow bag

Updated: October 2026

You are on a patio or an allotment path with one standard tomato grow bag, and the listing is a tomato greenhouse grow bag cover. The pairing holds when that house is about 100 cm wide and 40–50 cm deep. A cover about 2 m long is a different crop. The Royal Horticultural Society puts two cordon tomatoes in a standard growing bag, and one plant in a pot of 30–45 cm. This page uses that rate for the four 100 cm rows on the [tomato greenhouse](/hub/raised-beds-greenhouses-and-compost/tomato-greenhouse) comparison. Prices and review counts are amazon.co.uk figures from that set, read on 16 October 2026. The Products Compared editorial team did not grow a trial crop in these covers. A qualifying purchase through a product link can earn us a commission at no extra cost to you.

You are on a patio or an allotment path with one standard tomato grow bag, and the listing is a tomato greenhouse grow bag cover. The pairing holds when that house is about 100 cm wide and 40–50 cm deep.

Our top picks

VOUNOT VOUNOT tomato grow house, white, 100 cm

Best overall

VOUNOT VOUNOT tomato grow house, white, 100 cm
7.8/10about £23.49
View offer
Ohuhu Ohuhu tomato greenhouse, white, 200 cm

Rank 2

Ohuhu Ohuhu tomato greenhouse, white, 200 cm
8.2/10about £49.99
View offer
Outsunny Outsunny tomato greenhouse, 200 cm

Best value

Outsunny Outsunny tomato greenhouse, 200 cm
7.7/10about £27.99
View offer
On this page
  1. 1.One bag and two plants
  2. 2.The 100 cm houses in this set
  3. 3.Patio, soil, and a wet roof
  4. 4.When one bag is the wrong brief

One bag and two plants

The footprint over that bag is about 100 cm wide, 40–50 cm deep and 150 cm tall. Bergmis is the narrow case at 100 × 40 × 150 cm. DIVCHI and both VOUNOT 100 cm rows are 100 × 50 × 150 cm. A full bag sits closer to the cloth in the 40 cm house than under 50 cm, and you still plant two.

The 100 cm houses in this set

Bergmis is 100 × 40 × 150 cm at £14.99, with cloth at 130 g/m² and a peg kit in the box line. It shows 5.0 from one review, written before a season of use. DIVCHI is 100 × 50 × 150 cm at £15.47, with 4.1 from 223 reviews. Cloth weight is n/a, and pegs are absent from the box line. VOUNOT white is £23.49 and VOUNOT green is £24.99, both 100 × 50 × 150 cm at 135 g/m². Those review texts are pooled with the 200 cm file, and they describe this smaller house. You still plant two in that house. The best tomato greenhouse page is where those stars are read across the set.
VOUNOT VOUNOT tomato grow house, white, 100 cm

Testsieger

VOUNOT VOUNOT tomato grow house, white, 100 cm
7.8/10about £23.49
View offer

Patio, soil, and a wet roof

A peg holds only where it can enter the ground. On paving, a stake has nothing to bite. Ballast on the skirt, such as a water-filled container or a slab on the hem, plus tension in the tubes, keeps the roof from pooling. Tube order sits on how to put up a tomato greenhouse. RHS blight notes say covered plants are less exposed, and they still fail if spores get in and the foliage stays wet.

When one bag is the wrong brief

One standard bag and two cordons fill this footprint. A second bag needs roughly another 100 cm of width. Several pots, a second bag, or time standing inside belong with the longer cover. One bag, on paving or on the plot, stays with a 100 cm row and two plants.

Common questions

Will one standard bag fit a 100 cm house?
Yes. These one-bag houses are 100 cm wide, 40 or 50 cm deep, and 150 cm tall. Bergmis is 40 cm deep, while DIVCHI and both VOUNOT 100 cm rows are 50 cm deep. The bag sits on the floor. A full bag meets the cloth sooner in the 40 cm house, so measure your bag against that depth before you order.
How many tomato plants go in that bag?
Two cordon tomatoes is the RHS rate for one standard growing bag. One plant is the rate for a pot 30–45 cm across. The RHS says “standard growing bag” and gives no litre figure. Some shops put three plants in this footprint. Two tied cordons with trusses already fill a 100 × 50 × 150 cm house, which is the rate used here.
When can I put the plants out under the cover?
Put them out when the temperature is reliably above 16°C, the RHS line for final planting. These covers are unheated polyethylene, and no listing states a frost temperature. The frame can go over the bag earlier, once you have weighted the spot. The plants wait for days and nights above 16°C.
Why is a 5.0 from one review not a crop result?
Bergmis shows 5.0 from one amazon.co.uk review, written before a season of use. That comment can confirm the parts arrived and looked complete. It does not record wind, watering or blight across a summer. DIVCHI, at 4.1 from 223 reviews, is the larger set in this size, and those comments include sagging and extra weights.
Do the VOUNOT 100 cm reviews belong to the 200 cm house as well?
The texts are pooled with the 200 cm VOUNOT file, and they describe the smaller house. One of them mentions three plants in that small cover. Keep those sentences on the 100 × 50 × 150 cm rows. The RHS rate for a standard bag is two plants. Read the 2 m cover from its own listing.
What if the patio is paving, not soil?
Stakes need soil. On slabs, the Bergmis peg kit and the four VOUNOT ground stakes do not hold the frame alone. DIVCHI lists no pegs, and reviewers add weights where the cloth sags. A water-filled container or a paving slab on the hem, with the roof tensioned, keeps rain from pooling in the plastic. On an allotment bed, the stated pegs can take that role.

Related pages

Tomato greenhouse buying guide

Tomato greenhouse vs walk-in

Tomato greenhouse

Best tomato greenhouse for one grow bag or a 2 m cover

How to put up a tomato greenhouse on soil or paving

Sources

Public UK sources from the research digest, last checked on 16 October 2026.

  1. RHS — How to grow tomatoes (retrieved 16.10.2026)
  2. RHS — Tomato blight (retrieved 16.10.2026)
  3. RHS — Choosing a greenhouse (retrieved 16.10.2026)
  4. RHS — Ventilation and shading (retrieved 16.10.2026)
  5. Planning Portal — Outbuildings (retrieved 16.10.2026)
  6. Class E, GPDO 2015 (retrieved 16.10.2026)
  7. GOV.UK — General Product Safety Regulations 2005 (retrieved 16.10.2026)
  8. National Allotment Society — Allotment laws (retrieved 16.10.2026)