Mulberry care guide: when & how to prune, fertilize and spray
Morus alba, M. rubra, M. nigra and hybrids · USDA zones 5–10
Fast-growing, tough and very productive tree with blackberry-like fruit over several weeks in early summer. Needs almost no spraying. Most are self-fertile. 'Illinois Everbearing' is hardy to zone 5; black mulberry (M. nigra) has the best flavor but needs zones 7–10. Fruit stains, so don't plant over driveways, patios or sidewalks. Fruitless (male) types are sold as shade trees and won't bear.
☀️ Sun
Full sun for the best crops; tolerates part shade.
💧 Water
Drought-tolerant once established. Water deeply in dry spells while fruit is forming for bigger, juicier berries.
🪱 Soil
pH 6.0–7.5. Adaptable to almost any well-drained soil. Compost at planting. Little else needed.
How and when to prune mulberry
Dormant prune
When: 5–10 weeks before the last spring frost.
- zones 3–5: about Mar 1 – Apr 5
- zones 6–7: about Feb 4 – Mar 11
- zones 8–10: about Dec 17 – Jan 21
Mulberries bleed sap if cut once growth starts, so prune while fully dormant. Fruit forms on new shoots and short spurs, so moderate pruning keeps fruit within reach without losing the crop.
- Remove dead, broken, crossing and inward-growing branches.
- Keep the tree to a pickable height by cutting tall leaders back to an outward side branch.
- Thin crowded areas so light reaches the inside of the canopy.
- Avoid cuts larger than about 2 in (5 cm) across where possible. Big wounds heal slowly.
- Dwarf types in containers: shorten last year's shoots by about half to keep them compact. They fruit on new growth.
Tools: Bypass pruners, Loppers, Pruning saw
Trim after fruiting (optional)
When: 12–15 weeks after the last spring frost.
- zones 3–5: about Aug 2–23
- zones 6–7: about Jul 8–29
- zones 8–10: about May 20 – Jun 10
A light trim right after harvest controls size on vigorous trees and dwarf types without affecting next year's crop much.
- Shorten overly long new shoots by a third, cutting just above a leaf.
Fertilizing mulberry
Light spring feeding
When: from 1 week before to 3 weeks after the last spring frost.
- zones 3–5: about May 3–31
- zones 6–7: about Apr 8 – May 6
- zones 8–10: about Feb 18 – Mar 18
Mulberries need very little. A light feeding or compost each spring is plenty for in-ground trees. Container plants need more.
- In-ground: top-dress with compost, or apply a balanced fertilizer at half the label rate.
- Containers: feed with a balanced slow-release fertilizer each spring and a liquid feed monthly through summer.
What to use: 🌿 Finished compost or composted manure · 🌿 Balanced organic granular fertilizer (e.g. Espoma Plant-tone 5-3-3) · Slow-release balanced fertilizer (e.g. Osmocote Smart-Release 14-14-14)
Soil, compost & mulch for mulberry
Refresh mulch
When: 2–6 weeks after the last spring frost.
- zones 3–5: about May 24 – Jun 21
- zones 6–7: about Apr 29 – May 27
- zones 8–10: about Mar 11 – Apr 8
Mulch keeps roots cool and moist, suppresses weeds and slowly feeds the soil. Applying it after the soil warms lets roots wake up first.
- Spread 2–3 in (5–7 cm) of mulch over the root zone.
- Keep mulch 2–3 in (5–7 cm) away from stems and trunks. Mulch piled against bark invites rot and rodents.
- Don't go deeper than 3 in (7 cm) in total. Too much mulch suffocates roots.
What to use: 🌿 Shredded hardwood or pine bark mulch
Other care for mulberry
Harvest mulberries
When: 6–12 weeks after the last spring frost.
- zones 3–5: about Jun 21 – Aug 2
- zones 6–7: about May 27 – Jul 8
- zones 8–10: about Apr 8 – May 20
Berries ripen over several weeks and drop when ripe. Shaking onto a sheet is the easiest way to collect them.
- Spread an old sheet or tarp under the tree and gently shake the branches. Ripe berries fall; unripe ones stay.
- Repeat every couple of days through the season.
- Use within a day or two, or freeze. Mulberries are very soft.
- Wear old clothes. The juice stains.
Tools: Old sheet or tarp
Common mulberry problems and how to fix them
Birds
Signs: Ripe fruit disappears.
What to do: Mulberries ripen over weeks, so there's usually enough to share. Net small or dwarf trees.
Bacterial leaf spot / blight
Signs: Angular black spots on leaves and shoots in wet springs.
What to do: Prune out affected shoots in dry weather and rake fallen leaves. Copper at bud break in wet years.
Popcorn disease
Signs: Some berries swell into pale, popcorn-like lumps (mainly in the Southeast).
What to do: Pick off and destroy affected fruit to break the cycle.
Seedlings everywhere
Signs: Mulberry seedlings sprouting in beds and fence lines.
What to do: Pull young seedlings promptly. White mulberry is invasive in some regions.
Mulberry care FAQ
When should I prune mulberry?
Dormant prune: 5–10 weeks before the last spring frost (around Feb 4 – Mar 11 in zones 6–7). Trim after fruiting (optional): 12–15 weeks after the last spring frost (around Jul 8–29 in zones 6–7). Fast-growing, tough and very productive tree with blackberry-like fruit over several weeks in early summer. Needs almost no spraying. Most are self-fertile. 'Illinois Everbearing' is hardy to zone 5; black mulberry (M. nigra) has the best flavor but needs zones 7–10. Fruit stains, so don't plant over driveways, patios or sidewalks. Fruitless (male) types are sold as shade trees and won't bear.
What is the best fertilizer for mulberry?
Mulberries need very little. A light feeding or compost each spring is plenty for in-ground trees. Container plants need more. Good options: Finished compost or composted manure; Balanced organic granular fertilizer (e.g. Espoma Plant-tone 5-3-3); Slow-release balanced fertilizer (e.g. Osmocote Smart-Release 14-14-14).
What soil does mulberry need?
Adaptable to almost any well-drained soil. Preferred pH 6.0–7.5. Compost at planting. Little else needed.
How much sun and water does mulberry need?
Sun: Full sun for the best crops; tolerates part shade. Water: Drought-tolerant once established. Water deeply in dry spells while fruit is forming for bigger, juicier berries.
What are common mulberry problems?
Birds: Ripe fruit disappears. Mulberries ripen over weeks, so there's usually enough to share. Net small or dwarf trees. Bacterial leaf spot / blight: Angular black spots on leaves and shoots in wet springs. Prune out affected shoots in dry weather and rake fallen leaves. Copper at bud break in wet years. Popcorn disease: Some berries swell into pale, popcorn-like lumps (mainly in the Southeast). Pick off and destroy affected fruit to break the cycle. Seedlings everywhere: Mulberry seedlings sprouting in beds and fence lines. Pull young seedlings promptly. White mulberry is invasive in some regions.
More fruit care guides
Timings are given relative to your average frost dates, with examples for typical US climates. Always read and follow product labels.