Can you plant rosemary and thyme together?

Charts say yes. Nobody has tested rosemary with thyme, as far as we could find. Both are in the Lamiaceae family, so they share pests and diseases.

Why we can't give a firm answer

Garden charts recommend it. 1 garden chart entry recommends growing them together. It cites no source. Charts pass on gardening tradition; they are not tests.
List of companion plants (uncited entry) (Wikipedia)
Same family, shared pests. Rosemary and thyme are both in the Lamiaceae family, so the same pests and diseases can move from one to the other.
Crop Rotation in the Vegetable Garden (Steil · 2025 · Iowa State University Extension and Outreach, Yard and Garden)

What to plant with rosemary and thyme

Good neighbours of both, best tested first.

CabbageWith rosemary: Recommended by garden charts, not testedWith thyme: Bigger combined harvest

How each one was tested, with the evidence

What to keep away from rosemary and thyme

TomatoWith rosemary: Garden charts advise against it, not tested
BasilWith thyme: Garden charts advise against it, not tested

The evidence in detail

For readers who want to dig in: every chart entry, study and yield trial behind the answer above, with the numbers.

Tradition, research and yield trials

Same family, shared pests and diseases. Both in Lamiaceae: often susceptible to the same diseases and insects. Source: Iowa State University Extension and Outreach, Yard and Garden

Tradition

Good

avoidgood

1 chart entry: 1 recommend, 0 advise against.

0 cited, 1 uncited.

Research

No papers found on this pair.

Yield trial

No intercropping yield trial.

Untested folklore

What happens above and below ground

Each animation illustrates a mechanism a study reported for this pair. Pick a card to focus on it.

Everything at once.

Companion plants for both rosemary and thyme

Plants that are good neighbours of each. Biggest harvest gain first; each cell links to the evidence for that pair.

Plant	With rosemary	With thyme
Cabbage	No trial foundNot tested. Charts: recommend.Evidence for rosemary and cabbage	Bigger combined harvestField trial, 1 study. Charts: recommend.Evidence for thyme and cabbage

The evidence, with sources

TraditionGood1 entry

GoodRosemary helps Thyme
Rosemary: helps thyme
List of companion plants (uncited entry) (Wikipedia)

Same familyShares pests1 entry

Both in Lamiaceae: often susceptible to the same diseases and insects
Crop Rotation in the Vegetable Garden (Steil · 2025 · Iowa State University Extension and Outreach, Yard and Garden)

Plan a bed with rosemary and thyme

All neighbours of rosemary and of thyme, or every pair at once in the companion planting chart.

Have you grown rosemary and thyme together?

Tell other gardeners what happened: spacing, pests, harvest, or ask a question. Reader notes are not checked by us and do not change the verdicts on this page.