How to Grow Ritro
Echinops ritro
Your complete guide to growing Ritro.
📷 Wikimedia CommonsWhen to Plant Ritro
Planting windows vary by USDA hardiness zone. Look up yours by ZIP code.
| Zone | Start Indoors | Direct Sow | Harvest |
|---|---|---|---|
| Zone 1 | May – June | July – September | — |
| Zone 2 | April – May | June – August | — |
| Zone 3 | April – May | June – August | — |
| Zone 4 | March – April | June – July | — |
| Zone 5 | March – April | May – July | — |
| Zone 6 | March – April | May – July | — |
| Zone 7 | February – March | April – June | — |
| Zone 8 | February – March | April – June | — |
| Zone 9 | January – February | March – May | — |
| Zone 10 | January | February – April | — |
| Zone 11 | January | January – March | — |
| Zone 12 | January | January – March | — |
| Zone 13 | January | January – March | — |
Companion Plants for Ritro
✓ Good companions
Repels rodents and insects while attracting beneficial pollinators
Shares similar drought tolerance and attracts butterflies and beneficial insects
Attracts beneficial pollinators and repels pests with similar growing requirements
Provides structural contrast and wind protection while sharing drought tolerance
Similar water and soil requirements with complementary silvery foliage
Complementary bloom times and both attract pollinators while deterring garden pests
Similar low-maintenance requirements and provides late season pollinator support
Attracts beneficial predatory insects and improves soil structure with deep roots
✗ Keep away from
Produces juglone toxin that inhibits growth of many flowering plants
Blocks essential sunlight needed for proper flowering and growth
Creates overly moist conditions that can lead to root rot in drought-tolerant Globe Thistle
