Calendula / Pot Marigold Companion Plants
Calendula officinalis · aster family family · rotation group: other
The best companion plants for calendula / pot marigold are Lettuce, Cabbage and Kale, Tomato and Tomato. Avoid planting calendula / pot marigold near Powdery Mildew Susceptible Neighbours. Of the 4 pairings recorded here, 0 are supported by published research and 4 are traditional practice with no controlled evidence behind them.
What to plant with calendula / pot marigold
| Plant | Claimed benefit | Evidence | What the evidence actually shows |
|---|---|---|---|
| Cabbage and Kale | Calendula interplanted with brassicas reduces aphid damage. | Traditional | Plausible as a trap crop but untested; note calendula also hosts aphids, so it can seed the bed if left unmanaged. |
| Lettuce | Calendula shares lettuce's cool-season timing and adds floral resources to the bed. | Traditional | Good cultural fit since both tolerate light frost; the pest benefit is unverified, and sweet alyssum has far better evidence in lettuce. |
| Tomato | Calendula is a traditional tomato-bed flower said to deter pests. | Traditional | No controlled evidence; the marigold whitefly work applies to Tagetes patula, not to Calendula, which is a different genus entirely. |
What not to plant with calendula / pot marigold
| Plant | Claimed problem | Evidence | What the evidence actually shows |
|---|---|---|---|
| Powdery Mildew Susceptible Neighbours | Calendula is disease-free in the vegetable garden. | Traditional | Calendula is prone to powdery mildew and cucumber mosaic virus and can act as a reservoir beside susceptible crops. |
The honest verdict
None of the companion pairings commonly recommended for calendula / pot marigold have been confirmed in controlled trials that we could find. That does not make them harmful — it means the benefit is unproven, and you should plant for spacing, sun, and water compatibility first.
The remaining 3 pairings on this page are traditional practice. They circulate on every companion planting chart online, but we could not find controlled evidence testing them. They are not wrong so much as unverified — most cost nothing to try, and interplanting flowers and herbs has its own well-documented benefit of pulling pollinators and predatory insects into the garden.
Every row above links to the publication it came from. See how we grade evidence.
Other recorded effects
4Effects that aren't about a neighbouring plant — what calendula / pot marigold does for (or to) the garden around it, and the caveats attached to the popular versions of those claims.
| Effect | The claim | Evidence | What the evidence actually shows |
|---|---|---|---|
| Aphids (as a trap crop) | Calendula draws aphids and whiteflies away from nearby vegetables. | Traditional | Calendula is a documented host for aphids and whiteflies, which is the mechanism a trap crop needs, but no controlled trial has measured protection of a neighbouring crop. |
| Pollinators and Predators | Long-blooming open flowers feed hoverflies, lady beetles and pollinators. | Traditional | Open composite flowers are accessible to short-tongued beneficials; calendula itself was not among the plants in the controlled nectar trials. |
| Cut Flower and Edible Beds | Calendula petals are edible and used fresh or dried as a dye and garnish. | Research-backed | Edibility and dye use are documented by NC State Extension; petals have a slightly bitter, tangy, peppery flavour. |
| Substituting Calendula for French Marigold | Pot marigold works like French marigold for nematode control. | Not supported | A naming trap. The nematode-suppression research is specific to Tagetes, especially Tagetes patula; Calendula officinalis is an unrelated genus and carries none of that evidence. |
Growing calendula / pot marigold: the numbers
| Sun | Full sun (6+ hours) |
|---|---|
| Water | Moderate |
| Spacing | 12 in apart · 18 in between rows · 4 per square foot |
| Mature size | about 18 in tall |
| Soil pH | 6–7.5 |
| Days to maturity | 50–60 days |
| Frost tolerance | Half-hardy — takes a light frost |
| Containers | Yes — 2 gallon minimum |
| Common pests | aphids, whiteflies, slugs, snails |
| Common diseases | powdery mildew, cucumber mosaic virus |
When to plant calendula / pot marigold
Zone 6b shownStart seeds indoors: Feb 13 – Feb 27 — 6–8 weeks before your last frost
Transplant outdoors: Mar 27 – Apr 9 — 2 weeks before last frost
Direct sow outdoors: Mar 27 – Apr 9 — 2 weeks before last frost
Expected harvest: May 16 – May 26 — 50–60 days from planting
Fall planting: Sep 1 – Sep 14 — 8 weeks before your first fall frost
Those dates are for zone 6b. Get your own dates by ZIP code →
Varieties worth knowing
seeds- Resina — high-resin type preferred for salves and herbal use
- Pacific Beauty — long stems and good heat tolerance for cutting
- Indian Prince — deep orange with dark reverse; strong stems
- Zeolights — soft apricot tones popular for cut-flower work
Variety names link to seeds on Amazon. As an Amazon Associate we earn from qualifying purchases. These are the varieties named in the extension sources for this crop, not a paid placement — where a source recommended a variety for a specific reason, that reason is the note beside it.
Put it in a bed
The garden planner checks every square against this ledger as you place crops — if you drop calendula / pot marigold next to something recorded as a bad neighbour, the square turns red and tells you why.
Records for the plants named above:
Same rotation group (other) — don't follow one with another:
Calendula / Pot Marigold companion planting questions
What should not be planted next to calendula / pot marigold?
How far apart should calendula / pot marigold be planted?
Does companion planting with calendula / pot marigold actually work?
When should I plant calendula / pot marigold?
Sources for this record
- Calendula officinalis, NC State Extension Gardener Plant Toolbox
- Wolfe, K. (2020), Trap Cropping, WSU Extension Master Gardeners
Record compiled 2026-07. Spot an error or a study we missed? Tell us and we'll correct the entry.