Companion planting: what the science says
Companion planting means growing different plants side by side for a benefit: fewer pests, more pollinators, better use of space. Some effects are backed by research, but many of the charts you find online have no scientific basis. Use it as one more tool and don't count on guarantees.
What is documented
US university extension services accept that plant associations can have real physical, chemical and biological effects, but warn that the term “companion plant” is used loosely. The classic example is the “Three Sisters” (corn, beans and squash): corn gives support, beans fix some nitrogen and squash shades the soil.
In the app
Every plant in the catalogue lists its companions and rotations, so you can plan your beds with some method.
Guides in this section
Frequently asked questions
Does companion planting replace pest control?
No. It can reduce some problems, but it works alongside rotation, sensible spacing and regular checks.
Is there one chart that works everywhere?
No, because results depend on species, spacing, timing and climate. Treat any chart without sources with suspicion.
What is crop rotation?
Not growing the same plant family in the same spot year after year, to limit soil-borne pests and diseases.