How to Grow Florist Blue Boy
Centaurea cyanus
Your complete guide to growing Florist Blue Boy.
📷 Wikipedia: FlowerWhen to Plant Florist Blue Boy
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 Florist Blue Boy
✓ Good companions
Deters ants, aphids, and rodents while attracting beneficial pollinators
Attract beneficial insects and provide vertical interest without competing for nutrients
Repels moths, fleas, and mosquitoes while attracting pollinators
Repel aphids, whiteflies, and nematodes while attracting beneficial insects
Act as trap crops for aphids and cucumber beetles while deterring whiteflies
Repel aphids, tomato hornworms, and squash bugs
Attracts beneficial predatory insects and provides ground cover
Attract beneficial insects and butterflies, complement blue flowers aesthetically
✗ Keep away from
Release juglone toxin that inhibits growth of many flowering plants
Produces allelopathic compounds that suppress growth of nearby plants
Can be allelopathic and compete aggressively for water and nutrients
