How to Grow Phacelia
Phacelia tanacetifolia
Your complete guide to growing Phacelia.
📷 Wikimedia CommonsWhen to Plant Phacelia
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 Phacelia
✓ Good companions
Phacelia attracts beneficial wasps that parasitize bean pests like aphids
Draws beneficial insects that prey on cabbage worms and flea beetles
Attracts hoverflies and parasitic wasps that control carrot fly and aphids
Attracts pollinators and predatory insects that help with cucumber beetle control
Complementary pest control through different beneficial insect attraction
Attracts pollinators to improve fruit set and predators for pest control
Both attract similar beneficial insects creating a strong pollinator habitat
Phacelia attracts beneficial insects that control tomato hornworms and other pests
✗ Keep away from
Produces juglone which inhibits growth of many plants including Phacelia
Releases allelopathic compounds that suppress growth of nearby plants
Produces allelopathic compounds that inhibit germination and growth of most garden plants
