Why Are the Edges of My Pea Leaves Turning Brown?

Brown, dry margins on pea leaves — often called leaf scorch or leaf burn — are a symptom of water stress, wind damage, or, less commonly, a fungal disease. The characteristic pattern is a papery, crisp browning that starts at the leaf tip or margin and moves inward, while the centre of the leaf remains green and relatively healthy. This distinguishes drought scorch and wind damage from diseases, which tend to produce spots, rings, or irregular patches anywhere on the leaf surface rather than clean marginal browning.

Drought scorch — the most common cause

Peas need consistent moisture, particularly during flowering and pod fill when water demand is highest. If the soil dries out significantly between waterings, leaf margins are the first tissue to suffer — they are furthest from the vascular supply and the first to desiccate when the plant cannot take up water fast enough to meet transpiration demand. The result is a brown, papery margin that expands inward during dry spells. Watering deeply once or twice a week (rather than lightly every day) encourages roots to go deeper where moisture is more consistent, and mulching with straw or compost around the base significantly reduces evaporation.

Wind scorch

Peas grown in exposed positions subject to persistent wind develop a very similar marginal browning because wind dramatically accelerates water loss from leaf surfaces (transpiration) faster than roots can replace it. Plants growing on the windward edge of a row typically show the problem first. Providing a windbreak — a row of tall netting, a nearby hedge, or a temporary screen — on the prevailing wind side reduces scorch significantly. Climbing peas growing on netting actually benefit from the shelter the netting provides once established and foliage fills in.

Pea leaf and pod spot disease

Mycosphaerella pinodes (ascochyta blight complex) causes brown spots and blotches on pea leaves that can resemble scorch but are distinguishable by their irregular distribution on the leaf surface (not just margins), the presence of a darker border around individual spots, and the appearance of similar marks on pods and stems. Wet weather in spring promotes this disease. Remove affected material and improve air circulation by avoiding overcrowded plantings. There are no systemic fungicides approved for garden use — management is cultural.

Fertiliser burn

Applying fertiliser (especially granular forms) directly onto wet pea foliage, or using a high-concentration liquid feed incorrectly diluted, can cause marginal scorch that looks like drought damage. Check whether scorching appeared shortly after feeding. Always water thoroughly after applying granular fertilisers and ensure liquid feeds are correctly diluted per label instructions. Peas rarely need supplementary feeding but if applied, use a balanced, low-nitrogen feed after flowering.