What herbs pair poorly with basil?
Written by
Tina Carter
Reviewed by
Prof. Samuel Fitzgerald, Ph.D.Basil thrives when it is planted with other plants that won't compete or damage its growth. However, several herbs hinder the growth of basil. Rue, mint, and rosemary create undesirable growing conditions for basil through root competition, chemical interference, or just simply competing for different soil conditions. In particular, green-thumb gardeners need to recognize these problem herbs to sustain a healthy and bountiful garden.
Allelopathic Herbs
- Rue secretes alkaloids that reduce basil's oil production by 30%
- Plant at least 4ft (1.2m) apart to minimize chemical spread
- Replace with chamomile for pest control without growth inhibition
Moisture Conflicts
- Rosemary requires 50% less water than basil
- Shared soil leads to root rot in basil
- Use separate raised beds with different drainage layers
Mint has some risks lurking beneath the surface. Its aggressive rhizomes invade the root zone of basil plants. I have seen mint roots practically ensnare basil plants in a matter of about 45 days. Using bottomless buckets to hold mint in can mitigate that risk and protect the delicate feeder roots of the basil plants. This is also a somewhat attractive solution for mint management to maintain garden beauty and aesthetics.
Root Barriers
- Install 18-inch (45cm) metal edging between herbs
- Use fabric pots for invasive species like mint
- Refresh barrier layers every 2 growing seasons
Microclimate management assists incompatible herbs in coexisting. When planting rosemary, locate it on the south-facing sides of slopes, or in areas where the soil dries faster, and choose flat areas of land for basil plantings. The elevation difference will create moisture zones. Rather than planting basil with rosemary, use oregano, which has similar water needs and helps deter many pests that can be common to both plants.
Observe your flavorful herb garden weekly for early signs of conflict. Yellowing basil leaves beside rosemary indicate soil pH differences. Stunted basil growth next to the rue requires immediate replanting. With the right care to notice these signs and these tips, you'll be able to enjoy healthy basil in your garden despite its less-than-friendly neighbors.
Read the full article: Companion Plants for Basil: 10 Perfect Pairings for Your Garden
