Pick a crop and see what earns its place beside it — and, just as usefully, what doesn't.
Show me
With
Evidence
Well documented
Backed by a well-understood mechanism and field evidence — nitrogen fixation, physical support, trap cropping, shared disease.
Reasonable evidence
A sound mechanism with results that vary by soil, season and site. Worth doing; not a guarantee.
Tradition, not evidence
Repeated in every companion chart for decades but never reliably shown in trials. Kept here, and labelled honestly, so you can decide for yourself.
Free printable
Everything a first-time sower needs — sowing depths, timings and the fixes for what usually goes wrong — on one page.