About Leek
Leek releases sulphur compounds that deter many soil and flying pests — a classic companion for carrots and leafy greens. Alliums and legumes are famously poor neighbours in the same row.
Garlic rust is common in humid areas — rotate beds and avoid overcrowding.
Good companions
Plants that pair well with Leek — tap for their guides. Cited sources appear where research is linked in the matrix.
Leeks and carrots are a classic paired row — each may deter the other's root fly when alternated.
CeleryListed as beneficial in the matrix — open the grid for full context.
OnionListed as beneficial in the matrix — open the grid for full context.
BeetListed as beneficial in the matrix — open the grid for full context.
CabbageListed as beneficial in the matrix — open the grid for full context.
SpinachListed as beneficial in the matrix — open the grid for full context.
CeleriacListed as beneficial in the matrix — open the grid for full context.
Avoid planting together
Known poor neighbours — spacing apart or rotating beds reduces shared pest and disease pressure.
Listed as incompatible in the matrix — open the grid for full context.
PeaListed as incompatible in the matrix — open the grid for full context.
LentilListed as incompatible in the matrix — open the grid for full context.
Bean (Pole)Listed as incompatible in the matrix — open the grid for full context.
ParsleyListed as incompatible in the matrix — open the grid for full context.
Growing tips
- Plant garlic in autumn for mid-summer harvest in most NZ regions.
- Carrot + onion inter-rows remain a kitchen-garden standard.
- Keep alliums away from beans and peas — see incompatible list below.
Use the compatibility matrix
Filter to Leek to see green (beneficial), red (incompatible), and grey (neutral) for every pair among 162 plants. Desktop: hover cells. Mobile: tap for details.