Pea + Radish

Peas and radishes share compatible cool-season requirements, which makes their timing straightforward. Both tolerate light frost and perform best when soil temperatures stay between 45 and 65°F. Sow radishes at the same time as peas or a week ahead; most radish varieties reach harvest in 22 to 30 days and are pulled well before pea vines fill their allotted space. This staggered maturity means there is no meaningful competition for light or root room.

Radishes have a secondary benefit: their pungent foliage and volatile compounds are reported to deter cucumber beetles, which can damage emerging pea seedlings in gardens where beetle pressure is moderate. The effect is most reliable when radishes are interplanted densely enough to form a visible understory rather than scattered as single plants.

This pairing is least useful in warm climates where the planting window is short. If spring heats up quickly, both crops bolt within days of each other and the benefit is minimal.