Spinach Companion Plants
Spinacia oleracea · goosefoot family · rotation group: leafy
The best companion plants for spinach are Radish, Buckwheat, Sweet Alyssum, White Clover, and Pea. Avoid planting spinach near Beet, Swiss Chard, Potato, Fennel. Of the 12 pairings recorded here, 2 are supported by published research and 10 are traditional practice with no controlled evidence behind them.
What to plant with spinach
| Plant | Claimed benefit | Evidence | What the evidence actually shows |
|---|---|---|---|
| Buckwheat | A nearby buckwheat strip feeds hoverflies, lacewings and parasitoid wasps that attack spinach aphids. | Research-backed | University of Minnesota Extension cites trials in which flowering buckwheat and cowpea measurably increased predator and parasitoid numbers; the tested target pest was corn earworm, so the aphid benefit is extrapolated from the same mechanism. |
| Radish | Fast-maturing radishes use the between-row space before spinach fills in, and pull flea beetles off the spinach. | Research-backed | Radish and daikon are repeatedly confirmed as effective flea beetle trap crops in replicated trials, but nearly all of that work used brassica cash crops rather than spinach, so the transfer is an inference. |
| Cilantro | Cilantro allowed to flower supplies pollen and nectar to ladybugs and parasitic wasps. | Traditional | Virginia Cooperative Extension describes pollen-rich umbellifers as beneficial-insect habitat, but cites no trial quantifying pest reduction on a neighbouring crop. |
| Onion | Onions are said to deter leafminers and aphids from adjacent spinach. | Traditional | No controlled support found; a Scientific Reports study of leek grown beside sweet pepper found allium volatiles disrupted aphid feeding but actually raised aphid survival and fecundity, so allium 'repellency' should not be assumed. |
| Pea | Peas share spinach's cool-season window and a pea trellis casts light afternoon shade that delays bolting. | Traditional | The shared season and shading are real horticultural effects, but no trial has measured a bolt-delay benefit; the frequently added claim that pea nitrogen feeds the spinach is not supported. |
| Strawberry | Strawberries and spinach occupy different soil layers and are often interplanted in the same bed. | Traditional | A very common recommendation with no controlled evidence found; the only defensible rationale is spatial, not biochemical. |
| Sweet Alyssum | Low-growing alyssum flowers all season and supports syrphid flies whose larvae eat aphids. | Traditional | The underlying insectary mechanism is well supported, but no controlled trial pairing alyssum specifically with spinach was found; treat the aphid benefit as plausible rather than demonstrated. |
| White Clover | Undersown as a living mulch, clover reduces the number of pest insects that successfully land on the crop. | Traditional | The living-mulch effect is solidly demonstrated in brassicas at Warwick Crop Centre, but has not been tested on spinach, and clover competition can cut leaf yield if it is not mown or managed. |
What not to plant with spinach
| Plant | Claimed problem | Evidence | What the evidence actually shows |
|---|---|---|---|
| Beet | Beets are in the same family and host the same spinach leafminer and Cercospora leaf spot. | Traditional | The rotation principle — don't cluster crops that share pests and diseases — is standard extension guidance, but no study has measured the in-season penalty of planting beets beside spinach specifically. |
| Fennel | Fennel is claimed to release root compounds that inhibit most vegetable neighbours. | Traditional | Fennel allelopathy is documented in laboratory germination assays, but no field trial was found showing garden-scale suppression of spinach. |
| Potato | Potatoes are said to stunt spinach through competition and heavy shade. | Traditional | Repeated across garden charts with no supporting trial; competition for light and water is the only plausible mechanism and applies to any tall neighbour. |
| Swiss Chard | Chard is the same species group as beet and shares spinach's leafminer and leaf-spot problems. | Traditional | Same reasoning as beet; sound rotation logic, no controlled adjacency data. |
The honest verdict
Of everything gardeners recommend planting alongside spinach, 2 pairings have been tested properly: Radish, Buckwheat. Those are the ones worth planning your bed around.
The remaining 6 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.
Growing spinach: the numbers
| Sun | Full sun (6+ hours) |
|---|---|
| Water | Moderate |
| Spacing | 4 in apart · 14 in between rows · 9 per square foot |
| Mature size | about 10 in tall |
| Soil pH | 6–7 |
| Days to maturity | 37–48 days |
| Frost tolerance | Hardy — takes hard frost |
| Containers | Yes — 2 gallon minimum |
| Typical yield | 4-6 lb per 10-ft row |
| Common pests | spinach leafminer, aphids, flea beetles, slugs, cutworms |
| Common diseases | downy mildew, white rust, damping-off, cucumber mosaic virus |
When to plant spinach
Zone 6b shownStart seeds indoors: Feb 27 – Mar 6 — 5–6 weeks before your last frost
Direct sow outdoors: Mar 20 – Apr 2 — 3 weeks before last frost
Transplant outdoors: Apr 10 – Apr 23 — around your last frost date
Expected harvest: May 17 – May 28 — 37–48 days from planting
Fall planting: Sep 8 – Sep 21 — 7 weeks before your first fall frost
Those dates are for zone 6b. Get your own dates by ZIP code →
Varieties worth knowing
seeds- Bloomsdale Long Standing — heirloom savoy, slow to bolt, classic crinkled leaf
- Tyee — semi-savoy hybrid, downy mildew resistance, good for spring sowing
- Space — smooth-leaf hybrid, upright habit, easy to wash, good baby-leaf type
- Whale — savoy type selected for slow bolting in warm spring weather
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 spinach 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 (leafy) — don't follow one with another:
Spinach companion planting questions
What should not be planted next to spinach?
How far apart should spinach be planted?
Does companion planting with spinach actually work?
When should I plant spinach?
Sources for this record
- Growing Spinach, A Cool-Season Vegetable — Penn State Extension
- Spinach — Clemson Cooperative Extension HGIC
- How to Grow Spinach in Your Garden — Utah State University Extension
- Growing spinach and Swiss chard in home gardens — University of Minnesota Extension
Record compiled 2026-07. Spot an error or a study we missed? Tell us and we'll correct the entry.