AnyponicsPlanning · Yields
How many plants can I grow in a 4×4 space?
A 4×4 ft space, the size of the most popular grow tent, holds about 44 lettuce plants laid flat, 56 in vertical towers, or about 11 tomato plants. The crop sets the spacing, and the spacing sets everything else.
4×4 ft, by crop
| Setup | System | Plants | Build cost | Harvest /mo | Payback |
|---|---|---|---|---|---|
| Lettuce | Vertical Tower | 56 | $1,612 | 49 heads (16.1 lb) | 5+ years |
| Basil & herbs | Vertical Tower | 56 | $1,612 | 6.7 lb | 43 months |
| Strawberries | NFT | 28 | $849 | 5.2 lb | 5+ years |
| Tomatoes | Drip | 11 | $560 | 18.4 lb | 17 months |
| Peppers | Drip | 11 | $560 | 6.1 lb | 5+ years |
| Cucumbers | Drip | 13 | $564 | 26.2 lb | 16 months |
| Microgreens (trays) | Microgreens Tray | 11 | $852 | 28 trays (13.8 lb) | 4 months |
Leafy crops in a 4×4 default to vertical towers, which stack plants upward. Laid flat in a DWC raft, the same space holds 44 lettuce plants for $699.
Spacing by crop
| Crop | Plants per sq ft | Why |
|---|---|---|
| Lettuce, herbs | 4 | 6-inch centres; small, upright plants. |
| Strawberries | 2.5 | Runners and fruit trusses need room to hang. |
| Cucumbers | 1.2 | Trained up a string, but leaves spread wide. |
| Tomatoes, peppers | 1 | Large plants that need light reaching the lower leaves. |
| Microgreens | 0.7 trays | One 10×20 in tray per 1.4 sq ft of shelf, stacked in tiers. |
Flat systems keep about 30% of the floor for access; you need to reach every plant to harvest and to check roots.
The best use of a 4×4
For value, fruiting crops win: tomatoes and cucumbers produce kilograms per plant per season and pay back in 17 months and 16 months. For eating every day, lettuce and herbs. For the fastest return of all, microgreens: 4 months, because they sell at several times the price of lettuce.