Which herbs should never be planted together?

Written by
Michael Sullivan
Reviewed by
Prof. Charles Hartman, Ph.D.A few herb combinations can wreak havoc in your garden. Knowing which herbs should never be planted together ahead of time can save you a lot of trouble and effort. A few herb combinations can cause stunted growth or disease. I learned the hard way when mint took over my parsley patch. You won't have to go through the same learning experience.
Root System Conflicts
- Aggressive roots overwhelm delicate plants
- Mint rhizomes spread 3 feet yearly
- Shallow-rooted herbs get choked out
Chemical Incompatibility
- Fennel releases growth-inhibiting anethole
- Walnut trees affect nearby herbs
- Allelopathic chemicals stunt germination
Environmental Mismatches
- Drought vs moisture-loving herbs
- Sun vs shade requirements conflict
- Temperature tolerance differences
Identify conflict-prone plant pairings early, such as yellowing leaves and a lack of growth. You can inspect the roots - are they tangled beneath the soil? I observe my plants weekly from spring through fall. Your plant parents will determine it first before it escalates into a more severe issue. Remove the contradicting herbs immediately.
Make other arrangements for troublesome herbs. Plant invasive mint in sunken bottomless containers. Grow allelopathic fennel in isolated beds. Now the mint is thriving and won't bother the neighbors. Your solutions will allow our planting to coexist peacefully.
Instead, assemble compatible alternatives. Swap together pairs with another combination. Near sage, use rosemary instead of cucumbers. Instead of lemon balm, put chives near carrots. My sage is happy next to the drought-tolerant lavender. Your swaps will produce healthier gardens.
Take note of previous mistakes. Write down combinations you have tried in the past that have been failures for you. Adjust your planting plans as required from season to season. I keep a journal in my garden that tracks pairs of plants that are incompatible with each other. You will benefit from each planting experience over time. Prevention will just come naturally.
Read the full article: 16 Herb Companion Planting Pairs Revealed