A small greenhouse is the easiest way to start growing under cover when you don’t have room for a full glasshouse. Balcony grow-houses, mini walk-ins and compact lean-tos all extend the season and protect tender plants — but small volumes heat up and cool down fast, so a few choices matter more than they do on a big unit. Here’s how to pick one that actually works.
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Types of small greenhouse
- Mini growhouse / shelved cover — a tiered frame with a zip cover for a patio, balcony or against a wall; ideal for seedlings and a few pots.
- Compact walk-in — a small framed house you can step into; more stable and versatile than a growhouse.
- Lean-to / wall greenhouse — saves space and borrows warmth from a wall.
- Cold frame — the smallest option, excellent for hardening off and overwintering.
What matters most on a small unit
- Ventilation — small spaces overheat within minutes in sun. Choose covers with roll-up or zip vents and open them on warm days; see greenhouse ventilation.
- Stability — lightweight growhouses blow over easily. Tie or anchor them to a wall, railing or ground pegs.
- Shelving — tiered staging multiplies growing space in a tiny footprint.
- Cover quality — reinforced PE covers last longer; polycarbonate panels last longest.
Realistic seasonal use
A small unheated greenhouse is superb for spring seed-starting, hardening off, and protecting pots from frost — but a tiny volume won’t hold heat through a hard freeze without extra protection, and it can cook plants on a sunny winter afternoon. Vent daily and add fleece on cold nights.
Small & mini greenhouses
Growhouses with shelving
Quick questions
Will a mini greenhouse survive winter frost? It buys a few degrees and blocks wind, but small volumes lose heat fast — add fleece or a small heater for hard freezes.
How do I stop it blowing away? Anchor it to a wall, railing or ground pegs; never leave a lightweight cover un-secured.
Related guides
- Choosing a greenhouse · polycarbonate greenhouses · greenhouse ventilation
- Frost protection · starting seeds