How to Grow Full Sun Improved
Helianthus annuus
Your complete guide to growing Full Sun Improved.
📷 Wikipedia: Common sunflowerWhen to Plant Full Sun Improved
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 Full Sun Improved
✓ Good companions
Attracts pollinators and beneficial insects while improving soil health
Attract pollinators and beneficial insects while providing visual contrast
Repels moths, fleas, and mosquitoes while attracting bees and butterflies
Repel aphids, whiteflies, and nematodes while attracting beneficial insects
Act as trap crops for aphids and cucumber beetles, attract pollinators
Provide natural support structure and attract pollinators and beneficial birds
Attracts hoverflies and other beneficial insects that control aphids
Attract beneficial insects like ladybugs and parasitic wasps for pest control
✗ Keep away from
Produces juglone toxin that inhibits growth and can kill many flowering plants
Releases allelopathic compounds that suppress growth of nearby plants
Inhibits growth of most garden plants through allelopathic root secretions
