How to Grow Guardian Blue
Delphinium elatum
Your complete guide to growing Guardian Blue.
📷 Wikipedia: FlowerWhen to Plant Guardian 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 Guardian Blue
✓ Good companions
Deters ants, aphids, and rodents while attracting pollinators
Repel aphids and improve soil health with sulfur compounds
Attracts beneficial insects and provides structural support
Repels moths, fleas, and mosquitoes with aromatic oils
Repel nematodes and aphids while attracting beneficial insects
Act as trap crop for aphids and cucumber beetles
Attracts beneficial insects and provides ground cover protection
Attracts ladybugs and other beneficial predatory insects
✗ Keep away from
Releases juglone toxin that inhibits growth of many flowers
Allelopathic compounds suppress growth of nearby plants
Inhibits growth of most garden plants through allelopathy
