White clover Companion Plants

Claim. Undersowing cabbage with white clover reduced egg-laying and infestation by several cabbage pests in replicated field trials, and a 2023 meta-analysis of cabbage intercropping found substantially lower pest injury on average.

Mechanism. Ground cover of non-host plants disrupts pest host-finding ("inappropriate landings"): insects that land on clover leave the area more often than they find cabbage.

Studied in. Field trials in the UK and Netherlands; white cabbage undersown with clover; meta-analysis of cabbage intercropping trials. (field)

Conditions. Sow clover 2–4 weeks after transplanting cabbage, or mow established clover before transplanting. Continuous clover cover under and between cabbage plants. Clover must cover the ground while cabbage is vulnerable (transplant to heading).

Management. Mow or trim clover to 5 cm when it reaches 15 cm; Sow clover later than cabbage or keep it in strips to limit competition.

Applies when. Applies to home beds where the ground between cabbages can be fully covered; a few clover plants at one end will not reproduce the effect.

Limitations. The same trials and the meta-analysis found a modest reduction in cabbage head size or yield from competition. The benefit is lower pest injury, not higher yield.

Evidence. Tier A: Systematic review or meta-analysis, or multiple relevant replicated field studies with consistent results. (meta analysis).

Sources. Finch 2000; Theunissen 1995; Carrillo-Reche 2023

Reviewed August 15, 2026 by Garden Planner editorial team (pending independent horticultural review). Record white-clover--cabbage--living_mulch v1. Request a correction.

Claim. The cabbage–clover pest-disruption effect is expected to transfer to broccoli (the same species, Brassica oleracea) when the ground is fully covered, but the trials were on head cabbage.

Mechanism. Disruption of pest host-finding by non-host ground cover.

Studied in. Cabbage trials; broccoli is a related crop of the same species. (field)

Conditions. Sow clover after broccoli is established. Continuous ground cover. Both plants must be present at the same time.

Management. Mow clover to limit competition.

Applies when. Same conditions as for cabbage.

Limitations. Not directly tested on broccoli; competition reduces head size as in cabbage.

Evidence. Tier B: One or more relevant controlled field studies or an authoritative synthesis tied to the crop, effect and arrangement. (field trial).

Sources. Finch 2000; Theunissen 1995; Carrillo-Reche 2023

Reviewed August 15, 2026 by Garden Planner editorial team (pending independent horticultural review). Record white-clover--broccoli--living_mulch v1. Request a correction.

Claim. Unmanaged clover competes with cabbage for water and nutrients and reduced head size in field trials; the 2023 meta-analysis found a modest average productivity reduction.

Mechanism. Competition for water, nitrogen and light at the soil surface.

Studied in. Netherlands field trials; global meta-analysis. (field)

Conditions. Worst when clover is established before the cabbage. Full ground cover. Both plants must be present at the same time.

Management. Mow clover regularly; Delay clover sowing until cabbage is established; Irrigate in dry spells.

Applies when. A manageable trade-off, not a reason to avoid the pairing: accept a smaller head in exchange for lower pest pressure, or manage the clover.

Limitations. Yield cost varies with clover management, soil moisture and fertility.

Evidence. Tier B: One or more relevant controlled field studies or an authoritative synthesis tied to the crop, effect and arrangement. (field trial).

Sources. Theunissen 1995; Carrillo-Reche 2023

Reviewed August 15, 2026 by Garden Planner editorial team (pending independent horticultural review). Record white-clover--cabbage--root_competition v1. Request a correction.