About Pennyroyal
Pennyroyal brings scent, pollinators, or pest confusion to vegetable beds — placement at edges or in pots matters when roots spread aggressively.
NZ note
Rosemary and sage need sharp drainage; basil wants more warmth and water.
Good companions
Plants that pair well with Pennyroyal — tap for their guides. Cited sources appear where research is linked in the matrix.
Avoid planting together
Known poor neighbours — spacing apart or rotating beds reduces shared pest and disease pressure.
No incompatible companions listed — check the full matrix for neutral pairings.
Growing tips
- Harvest regularly to prevent woody, leggy growth on Mediterranean herbs.
- Contain mint, lemon balm, and nettle — pots or root barriers.
- Check allelopathic herbs (fennel, wormwood) — keep away from most veg root zones.
Use the compatibility matrix
Filter to Pennyroyal to see green (beneficial), red (incompatible), and grey (neutral) for every pair among 162 plants. Desktop: hover cells. Mobile: tap for details.