How to Grow Iron White
Matthiola incana
Your complete guide to growing Iron White.
📷 Wikipedia: FlowerWhen to Plant Iron White
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 White
✓ Good companions
Attracts beneficial insects and may help deter certain soil pests
Repels ants, aphids, and rodents while attracting beneficial insects
Attracts beneficial insects and provides complementary height structure
Repels pests with strong fragrance and attracts pollinators
Repel nematodes and aphids while attracting beneficial insects
Act as trap crops for aphids and cucumber beetles
Attracts beneficial predatory insects and provides ground cover
Attracts butterflies 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
