How to Grow Firmament
Cynoglossum amabile
Your complete guide to growing Firmament.
📷 Wikimedia CommonsWhen to Plant Firmament
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 Firmament
✓ Good companions
Repels garden pests and attracts beneficial pollinators
Deters aphids and Japanese beetles with strong sulfur compounds
Attracts beneficial insects and provides natural pest control
Deters pests with fragrant oils and attracts pollinators
Repels nematodes and aphids while attracting beneficial insects
Acts as trap crop for aphids and cucumber beetles
Attracts beneficial insects like lacewings and parasitic wasps
Improves soil health and attracts predatory insects
✗ Keep away from
Produces juglone which is toxic to many flowering plants
Releases allelopathic chemicals that inhibit nearby plant growth
Inhibits growth of most garden plants through allelopathy
