How to Grow Iron Purple
Matthiola incana
Your complete guide to growing Iron Purple.
📷 Wikipedia: FlowerWhen to Plant Iron Purple
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 Iron Purple
✓ Good companions
Repels ants, aphids, and mosquitoes effectively
Attracts beneficial insects and provides vertical interest
Repels moths, fleas, and mosquitoes while attracting pollinators
Repel nematodes and aphids while attracting beneficial insects
Act as trap crops for aphids and cucumber beetles
Repel aphids, tomato hornworms, and other garden pests
Attracts beneficial predatory insects and provides ground cover
Attracts pollinators and beneficial predatory insects
✗ Keep away from
Produces juglone toxin that inhibits growth of many flowering plants
Releases allelopathic compounds that suppress nearby plant growth
Inhibits growth of most garden plants through allelopathy
