Fennel
Companion plants for fennel
The best companion plants for fennel are peppers and melons. None of the plants we track is a clear bad neighbour. Of the 10 plants we have data on, 2 are good neighbours, 0 are bad ones and 2 are contested. 5 of these verdicts rest on field trials or research papers; the rest come from traditional companion-planting charts.
- 2 good
- 0 to avoid
- 2 contested
- 5 tested in trials or papers
Neighbours of fennel at a glance
Inner rings are backed by trials or papers, outer rings by charts only. Pick a plant to see its sources.
The interactive map needs JavaScript. Every plant on it is listed below with its evidence.
Good companion plants for fennel
Biggest harvest gain first, then the plants tested without a yield count. Each row links to the full evidence for the pair.
| Plant | What trials found with fennel | Tested by | Garden charts |
|---|---|---|---|
 Pepper |
Less disease | Greenhouse or pot trial1 study | Not listed |
 Melon |
Bigger combined harvest | Field trial1 study | Not listed |
Harvest from the same space compares a bed with both crops against the same area split into single-crop beds, counting the harvest of both crops (the land equivalent ratio in yield trials).
What not to plant with fennel
No plant in our data is a clear bad neighbour for fennel.
Relatives that share pests and diseases
| Plant | What trials found with fennel | Tested by | Garden charts |
|---|---|---|---|
 Carrot |
No trial foundSame family (Apiaceae): shares pests and diseases | Not tested | Not listed |
 Parsnip |
No trial foundSame family (Apiaceae): shares pests and diseases | Not tested | Not listed |
 Celery |
No trial foundSame family (Apiaceae): shares pests and diseases | Not tested | Not listed |
 Parsley |
No trial foundSame family (Apiaceae): shares pests and diseases | Not tested | Not listed |
 Cilantro |
No trial foundSame family (Apiaceae): shares pests and diseases | Not tested | Not listed |
Contested pairings
The sources disagree, or the charts say one thing and the trials another. Open a pair before you plant it.
| Plant | What trials found with fennel | Tested by | Garden charts |
|---|---|---|---|
 Tomato |
Less disease133% more harvest from the same space | Field trial3 studies | Advise against |
 Dill |
13% less harvest from the same spaceSame family (Apiaceae): shares pests and diseases | Field trial1 study | Recommend |
No measurable effect
| Plant | What trials found with fennel | Tested by | Garden charts |
|---|---|---|---|
 Cabbage |
No effect on harvest | Field trial1 study | Not listed |
Sources
8 sources behind the verdicts on this page. 1 chart entry cite no source and are marked as tradition only.
Show all 8 sources
Same family (Apiaceae): Carrot, Parsnip, Celery, Parsley, Dill, Cilantro.
What grows well with your fennel?
Share what worked next to your fennel and what did not, or ask other growers a question. Reader notes are not checked by us and do not change the verdicts on this page.