How to Grow Potomac Red
Antirrhinum majus
Your complete guide to growing Potomac Red.
📷 Wikipedia: Antirrhinum majusWhen to Plant Potomac Red
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 Red
✓ Good companions
Attracts beneficial insects like lacewings and hoverflies that control pests
Deters ants, aphids, and rodents while attracting beneficial pollinators
Repel aphids and Japanese beetles with their strong sulfur compounds
Attract beneficial insects and provide structure without competing for nutrients
Repels moths, fleas, and mosquitoes while attracting pollinators
Repel nematodes, aphids, and other pests while attracting beneficial insects
Act as trap crops for aphids and cucumber beetles while repelling squash bugs
Attracts predatory wasps and ladybugs that control harmful insects
✗ Keep away from
Produces juglone toxin that inhibits growth and can kill sensitive plants
Releases allelopathic compounds that suppress growth of nearby plants
Release allelopathic chemicals and compete aggressively for water and nutrients
