How to Grow Tall Blue Planet
Ageratum houstonianum
Your complete guide to growing Tall Blue Planet.
📷 Wikimedia CommonsWhen to Plant Tall Blue Planet
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 Tall Blue Planet
✓ Good companions
Repels harmful insects and attracts beneficial predatory insects
Repels ants, aphids, and rodents while attracting beneficial pollinators
Attracts beneficial insects and provides structural support without competition
Repels moths, fleas, and mosquitoes with its strong fragrance
Repel aphids, whiteflies, and nematodes while attracting beneficial insects
Act as trap crops for aphids and cucumber beetles while repelling squash bugs
Attracts beneficial insects like lacewings and hoverflies that control pests
Attracts butterflies and beneficial pollinators while providing complementary colors
✗ Keep away from
Produces juglone toxin that inhibits growth and can kill sensitive plants
Produces allelopathic oils that suppress growth of other plants in vicinity
Releases allelopathic compounds that inhibit growth of nearby flowering plants
