How to Grow Tower Blue
Callistephus chinensis
Your complete guide to growing Tower Blue.
📷 Wikimedia CommonsWhen to Plant Tower Blue
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 Tower Blue
✓ Good companions
Deters aphids, ants, and rodents while attracting beneficial pollinators
Attract beneficial pollinators and predatory insects while providing height contrast
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, drawing pests away
Repel aphids, tomato hornworms, and squash bugs with natural compounds
Attracts beneficial insects like lacewings and provides ground cover
Attract butterflies, bees, and beneficial predatory insects
✗ Keep away from
Produces juglone toxin that inhibits growth of many flowering plants
Releases allelopathic compounds that suppress growth of nearby plants
Can inhibit growth of nearby plants through allelopathy and resource competition
