A perpetual harvest means running plants in different stages simultaneously so there's always something ready to cut. Instead of one big harvest followed by months of waiting, you pull down a plant (or a few) every 2–4 weeks. It's how commercial grows operate, and home growers can do it on a smaller scale.
The core concept
A single photoperiod plant takes roughly 4 months from seed/clone to harvest (4 weeks veg + 8 weeks flower + 2 weeks dry/cure). In a perpetual setup, you stagger multiple plants so when one finishes flower, the next is entering flower, the one after that is in mid-veg, and the newest is just rooting.
The result: continuous, predictable harvests. No feast-or-famine cycles.
What you need
Minimum: two separate light zones
You cannot run perpetual with one light on one timer. Veg plants need 18/6 (or 20/4) while flowering plants need 12/12. You need at least two isolated spaces:
| Zone | Light cycle | Purpose |
|---|---|---|
| Veg chamber | 18/6 or 20/4 | Seedlings, clones, veg plants |
| Flower tent | 12/12 | Plants in bloom |
A common setup:
- Flower tent: 4×4 or 4×2 (your main light, your best environment)
- Veg space: 2×2 tent, shelf with a grow light, closet with a T5
The veg space doesn't need to be fancy — plants in veg are forgiving. The flower tent is where you invest.