How to Grow Katz Hi Double White
Matthiola incana
Your complete guide to growing Katz Hi Double White.
📷 Wikipedia: FlowerWhen to Plant Katz Hi Double 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 Katz Hi Double White
✓ Good companions
Compatible trailing companion with similar care needs and extended bloom period
Repels ants, mosquitoes, and rodents while attracting beneficial bees
Provides complementary low-growing ground cover and attracts pollinators
Repel aphids, whiteflies, and nematodes while attracting beneficial insects
Act as trap crop for aphids and cucumber beetles, drawing pests away from petunias
Attracts beneficial insects like hoverflies and parasitic wasps for natural pest control
Similar growing conditions and attracts butterflies for garden biodiversity
Attracts ladybugs and other beneficial predators that control aphids
✗ Keep away from
Produce juglone toxin that causes wilting and stunted growth in petunias
Produces allelopathic oils that suppress growth of most flowering annuals
Release allelopathic compounds that inhibit germination and growth of nearby flowers
