How to Grow Potomac Yellow
Antirrhinum majus
Your complete guide to growing Potomac Yellow.
📷 Wikipedia: Antirrhinum majusWhen to Plant Potomac Yellow
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 Potomac Yellow
✓ Good companions
Repels mosquitoes, ants, and rodents effectively
Attracts pollinators and beneficial predatory insects
Repels moths, fleas, and mosquitoes with its strong fragrance
Repel nematodes and aphids while attracting beneficial insects
Act as trap crop for aphids and cucumber beetles
Repel aphids, tomato hornworms, and squash bugs
Attracts beneficial predatory insects like lacewings and hoverflies
Attracts butterflies and beneficial insects while providing complementary colors
✗ Keep away from
Produces juglone toxin that inhibits growth of many flowering plants
Strong allelopathic properties suppress germination and growth of other plants
Releases allelopathic compounds that stunt growth of nearby plants
