Crops & Breeds › Flower Garden
🌸 Iris
Flower Garden · growing reference
| Days to maturity | 210 days – 300 days, by type |
|---|---|
| Germination | 20 days |
| Spacing | 12″ in the row × 18″ between rows |
| Planted as | seed |
| Water | ~0.75–1.5 in a week |
When to plant
In USDA zone 6, for example: Plant around Sep 8 — about six weeks before your first frost. It roots in over winter and comes up in spring; there is no spring planting for this one.
| Fall | |
|---|---|
| Zone 3 | Aug 9 |
| Zone 4 | Aug 14 |
| Zone 5 | Aug 27 |
| Zone 6 | Sep 8 |
| Zone 7 | Sep 29 |
| Zone 8 | Oct 14 |
| Zone 9 | Oct 29 |
Dates are the typical window for each zone's average frost dates — your own last frost can differ by a couple of weeks. Zone 10 and warmer is effectively frost-free: plant to the season, not the frost. Southern Hemisphere: shift six months.
Iris Types
- Bearded · 300 days · 2–5 stems/plant — The classic ruffled bearded iris — plant the rhizome shallow, half-exposed; blooms late spring.
- Siberian · 300 days · 3–8 stems/plant — Beardless, grassy, damp-tolerant — tough and long-lived; from a rhizome division.
- Dutch · 210 days · 1–2 stems/plant — The florist's spring cut iris — a fall-planted bulb; sleeker and earlier.
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