Can Spinach and Leafy greens (lettuce, herbs) share one grow tent?
One tent means one light, one timer and one climate. This is what Spinach and Leafy greens (lettuce, herbs) each need, and which differences moving the pots can fix.
The short answer
- Light: at their most demanding stage, no single light level suits both. Spinach wants 300–345 µmol/m²/s, Leafy greens (lettuce, herbs) 210–295. (Placement can fix this)
- Day length: both are usually grown at 16 h, so one timer suits both.
- Temperature: both are comfortable at 16–22 °C.
- Humidity: both are comfortable at 50–70 % RH.
Light, stage by stage
| Spinach | PPFD | Leafy greens (lettuce, herbs) | PPFD | Suits both |
|---|---|---|---|---|
| Seedling | 50–150 µmol/m²/s | Seedling | 175–260 µmol/m²/s | none |
| Seedling | 50–150 µmol/m²/s | Growth | 175–260 µmol/m²/s | none |
| Seedling | 50–150 µmol/m²/s | Mature | 210–295 µmol/m²/s | none |
| Growth | 300–345 µmol/m²/s | Seedling | 175–260 µmol/m²/s | none |
| Growth | 300–345 µmol/m²/s | Growth | 175–260 µmol/m²/s | none |
| Growth | 300–345 µmol/m²/s | Mature | 210–295 µmol/m²/s | none |
| Mature | 300–345 µmol/m²/s | Seedling | 175–260 µmol/m²/s | none |
| Mature | 300–345 µmol/m²/s | Growth | 175–260 µmol/m²/s | none |
| Mature | 300–345 µmol/m²/s | Mature | 210–295 µmol/m²/s | none |
They share a light level in 0 of 9 stage combinations.
For plants whose target is daily light (DLI), the PPFD shown is at their usual day length. On a different timer it changes.
How to make it work
Light is strongest under the centre of the fixture and weaker towards the edges. Put Spinach under the centre and Leafy greens (lettuce, herbs) towards an edge or the back of the tent.
If Spinach still falls short, lift its pot on a box: closer to the light means more light, without changing anything for Leafy greens (lettuce, herbs).
Where exactly, in your tent?
That depends on your tent, your fixture and how high it hangs. Add Spinach and Leafy greens (lettuce, herbs) in the app and it shows where each pot gets its own light.