How to care for a Paper Mulberry (Broussonetia papyrifera) with burned and holey leaves

Quick diagnosis

Your Paper Mulberry (Broussonetia papyrifera) shows signs of leaf stress: brown, dry edges and leaves with holes or tears. These symptoms are usually due to a combination of: exposure to intense sun, irregular watering, chewing insect damage, or mechanical damage (wind, rubbing). The problem is considered mild to moderate: there is visible leaf damage, but no widespread necrosis or massive leaf drop.

Probable causes

• Exposure to intense direct sun causing burns on leaf edges.
• Irregular watering with episodes of dehydration that produce dry edges.
• Chewing insects (caterpillars, beetles, grasshoppers) that make holes and bites.
• Mechanical damage from wind, branches, or objects rubbing the leaves and causing tears.

What to do now: immediate measures

Adjust location and light

• If the plant is in full sun and shows burns: move it to a spot with morning sun or light shade during the strongest radiation hours.
• If potted, move it gradually (a few days in partial shade) to avoid shock from an abrupt light change.

Regulate watering

• Keep the substrate moist but not waterlogged. Check moisture 3–5 cm deep.
• Water when the soil is slightly dry at that depth; avoid alternating waterlogging and drought periods.

Pest inspection and control (gentle methods)

• Check leaves (upper and lower surfaces) and shoots for caterpillars, beetles, eggs, or droppings.
• Remove visible pests and eggs by hand.
• For non-aggressive control: apply potassium soap or a solution of water with a few drops of mild soap to affected leaves; repeat every 5–7 days while you see active insects.

Pruning and mechanical protection

• Remove only fully unsalvageable leaves to improve appearance and reduce pest refuges.
• Avoid heavy pruning unless you detect diseased or structurally damaged branches.
• Protect the plant from rubbing (move objects that brush it) and, if possible, reduce exposure to strong winds.

Substrate and fertilization

• If potted and the substrate hasn’t been renewed for a long time, consider replacing the top layer or repotting into fresh substrate.
• Apply a balanced slow-release fertilizer in spring or summer; avoid overfertilizing, as excess can weaken the plant.

Practical follow-up: 7–14 day checklist

Observe and note these aspects over 1–2 weeks to evaluate recovery:

• Do new leaves show fresh bites or holes?
• Do brown edges stop appearing and are new leaves healthy?
• Are visible insects detected when inspecting in the morning?
• Does the substrate maintain even moisture after adjusting watering?
• If you changed position, do new leaves show better color and absence of burns?

When to worry and next steps

• If damage progresses (more affected leaves, defoliation, or signs of necrosis), perform a more thorough inspection looking for hidden pests or secondary diseases.
• For persistent pests not controlled with potassium soap and manual measures, consider specific products recommended for gardening or consult a plant health technician.

Final summary

With adjustments in position (less direct sun), regular watering, gentle pest control, and minimal pruning of unsalvageable parts, a Paper Mulberry with mild to moderate stress usually recovers well. Observe the plant for 7–14 days and act if new symptoms appear or the situation worsens.