Weeping mulberry

Care Guide: Planting, Soil & Watering

Overview: Weeping mulberry (Morus pendula) is a deciduous fruiting tree that grows best in full sun in a temperate or mediterranean climate (hardiness zone 5–10). It is adaptable to a wide range of well-drained soils and is fairly drought-tolerant once established, though it appreciates extra water while the fruit forms.

Quick Care Requirements

Requirement	Ideal Condition
Planting Season	End of winter to early spring, while dormant
Growth Rate	Moderate to Fast
Soil Type	Deep, well-draining; adaptable to most soils
Water Need	Low to Moderate – drought-tolerant once established

Planting & Establishment

• Best Planting Season: Plant while the tree is dormant, at the end of winter or in early spring, so the roots settle in before growth begins.
• How to Plant:
  • Hole Preparation: Dig a hole about twice the width of the root ball and no deeper, so the tree sits at the level it grew in the nursery.
  • Soil Amendments: Loosen the native soil and mix in compost or well-rotted organic matter; mulberries are not fussy but reward fertile, free-draining ground.
  • Planting Depth: Set the root collar (and any graft union) at or just above soil level – never bury the stem.
• Growth Speed & Expectations: Moderate to fast in good conditions; young trees usually begin bearing within about two years.

Soil, Watering & Drainage Care

• Soil Mix & Drainage Needs: Deep, well-drained soil is ideal; mulberries tolerate poorer ground but dislike waterlogging, which can rot the roots.
• Watering Schedule & Technique:
  • Young / Newly Planted: Water regularly through the first season to build a strong root system, keeping the soil moist but never soggy.
  • Established: Largely drought-tolerant; water deeply but occasionally, and step up watering while the fruit is swelling and ripening.
  • Seasonal Adjustments: Cut back or stop watering in winter while the tree is dormant, and water more during prolonged heat.

Growing in Pots, Balconies & Indoors

The weeping mulberry (Morus ‘Pendula’) is ultimately a full-size tree (3-5 m (10-15 ft)), so a pot suits it only while young – the grower confirms it is not a houseplant. Kept in a large tub on a sunny patio or balcony it grows happily for a few years before it needs the open ground or ever-bigger pots. Its compact weeping form makes it one of the friendlier mulberries for a big tub.

Quick Details

• Container Size: Large tub (40-60 L+ while young), stepped up over time
• Indoor Suitability: Not a houseplant – too large and too light-hungry for indoors
• Best Spot: Full sun – the sunniest, warmest patio or balcony you have
• Soil & Drainage: Aerated, organic-rich mix that drains freely
• Watering in Pots: A modest amount of water – potted trees dry fast, so check often

Indoors & On the Windowsill

• Houseplant limits: Not an indoor plant – it grows into a sizeable tree and needs far more light than a room can give; a bright window is no substitute for open sun.
• Overwintering: Hardy once established; a young potted tree in a very cold area can still be given a sheltered spot for its first winters.

On a Balcony or Patio

• Light & wind: Give it the sunniest spot; stake a young tree against wind, and remember walls and paving reflect heat so pots dry quickly – check moisture daily in hot spells.
• Weight & drainage: A filled tub is heavy – use a stable, wide container and make sure a balcony can take the load and drain the run-off.

Choosing the Pot, Soil & Long-Term Care

• Pot & drainage: A large, heavy tub while young (think 40-60 L and up), stepped up as it grows; strong drainage holes, and skip a standing-water saucer to avoid root rot. Terracotta breathes and dries faster, glazed or plastic holds moisture longer.
• Potting mix: A well-aerated, organic mix – peat or coir with perlite (and a little vermiculite) – giving roots both moisture and air.
• Feeding: Potted plants need feeding more often than those in the ground, since watering leaches nutrients from the mix – a balanced feed through the growing season keeps them productive.
• Holding its size: To keep a tree small in a pot for longer, root- and top-prune every year or two (a bonsai-style approach) and refresh part of the mix.

Bloom & Flower Guide

Quick Details

• Bloom Season: Spring
• Flower Appearance: Small greenish-white flowers packed into short catkins (“cones”); trees are usually either male or female
• Edibility: Ornamental weeping form – grown for its shape and shade; the flowers themselves are not eaten

Detailed Blooming Overview

In spring the weeping mulberry produces its flowers as short catkins – small greenish-white blooms grouped tightly together into a little cone shape. They are easy to miss among the emerging leaves. Mulberries are usually either male or female, so a single tree carries only one kind of flower.

Flower Characteristics

• Small greenish-white flowers grouped into short catkins.
• Male and female flowers on separate trees.
• Modest and easily overlooked.

Bloom Care & Thinning

• Thinning: Only really needed in the first year; after that the tree looks after itself.
• Pollination: Wind-pollinated – mulberry releases clouds of pollen to the breeze rather than relying on insects, so bees and flies play little part in setting the crop.

Pruning, Training & Seasonal Maintenance

Weeping mulberry is grown purely as a small ornamental tree for its cascading, downward-arching branch habit, and its own facts confirm this weeping structure directly. Like other mulberry cultivars grown for a distinct habit, weeping forms are almost always produced by grafting a weeping scion onto an upright trunk at a set height, so pruning here has a job the other entries in this batch don’t: keeping the graft union clean of vigorous, upright, non-weeping growth so the cascading form isn’t lost. Structural cuts are made in deep dormancy at the end of autumn/start of winter, avoiding the heavy sap bleeding mulberries show when cut while actively growing.

Quick Pruning & Maintenance Specs

Pruning Tolerance	Moderate
Primary Pruning Window	End of autumn to start of winter (dormant)
Typical Frequency	Once annually, plus spot removal of reversion/sucker growth whenever seen
Main Objective	Preserve the weeping form; keep the canopy clear of the ground and of upright reversion growth
Young Plant Priority	Establish the trunk/graft point; remove any rootstock suckers below the union on sight
Mature Plant Priority	Head back overly long cascading streamers; remove reversion shoots inside the canopy
Best Tool Type	Bypass secateurs and a pruning saw for the trunk/graft area; soft ties for young cascading branches
Avoid Heavy Pruning During	Active spring growth/sap rise

Pruning by Plant Age & Size

Newly Established

Confirm the graft union is clean and remove any growth arising from below it immediately; avoid heavy top pruning while the young tree establishes.

Young / Formative

Top-grafted/standard training: the single trunk to the graft point is fixed, so formative work is about guiding the first cascading branches evenly around the head and staking the young trunk if needed, not building a leader system as in a seedling-grown mulberry.

Mature / Established

Annual dormant thinning of overcrowded weeping streamers, heading back any that touch the ground or tangle, and ongoing removal of upright reversion shoots that don’t follow the weeping habit.

Seasonal Pruning Schedule

Stage	Objective	Remove	Do NOT remove	Flowering/fruiting impact
Dormant (end of autumn–start of winter)	Maintain the weeping silhouette and canopy clearance	Overlong or crossing weeping streamers; any upright, non-weeping reversion growth; suckers from below the graft union	Healthy cascading branches that define the form	Minimal – this tree is grown for form, not for a fruit crop
Ongoing / sanitary	Catch reversion growth early	Any vigorous upright shoot arising from the trunk or graft union as soon as it appears	Weeping branches	Prevents the more vigorous upright rootstock growth from overtaking and hiding the weeping form

Structural Pruning & Training

• Rootstock/reversion control is the defining structural task for a grafted weeping form: any upright shoot is more vigorous than the weeping scion and will dominate if left, effectively reverting the tree to a non-weeping habit.
• Canopy density: thin overcrowded cascading branches so light reaches the interior and streamers don’t tangle or rub.
• Height & spread control at ground level – head back streamers that reach or drag on the soil.

Special Growth to Remove

• Rootstock suckers arising below the graft union – remove promptly at their point of origin.
• Upright reversion shoots within the weeping canopy that don’t follow the cascading habit.
• Weeping streamers that have grown long enough to touch the ground.

Container & Small-Space Pruning

A compact ultimate size (3–5 m) and good container tolerance per source make this a good candidate for containers; in a pot, head back streamers a little more assertively to keep the canopy in scale, and check the graft area even more often since restricted roots can push more basal/sucker growth.

Tools

• Bypass secateurs for streamer heading and reversion-shoot removal.
• Pruning saw for any thick sucker growth at the trunk or graft union.
• Soft ties/stakes to support and guide young cascading branches or the young trunk itself.

Tool Hygiene & Disease Risk

Routine – clean, sharp tools are sufficient; the main documented pest is silkworm larvae feeding on foliage rather than a cut-transmissible disease.

Cut Placement & Technique

Remove rootstock suckers flush at their point of origin on the trunk, not partway up the shoot, or they will simply regrow; head weeping streamers back to a downward- or outward-facing point that continues the cascading line.

Heavy Pruning & Rejuvenation

Only moderate rejuvenation is appropriate – this is a small ornamental form, and hard cutting into old wood risks losing the graft-defined weeping shape rather than simply forcing more of it; if the canopy has become congested, thin it over a season or two rather than cutting hard all at once.

Post-Pruning Care

No extra feeding needed after a dormant cut; keep an eye on the graft union and trunk base through the growing season for any renewed sucker growth, since this is the single most common way the weeping form is lost.

Common Pruning Mistakes

• Missing rootstock suckers until they’ve grown large and started to dominate the canopy.
• Letting weeping streamers reach the ground, where they can root or simply look untidy.
• Treating it like a seedling mulberry and trying to build an upright leader, working against the grafted weeping form.

When NOT to Prune

Avoid pruning during active spring sap rise, and avoid heavy pruning immediately after transplanting a young standard.

Recommended Tools (by task)

• bypass_secateurs – streamer heading and reversion-shoot removal.
• pruning_saw – thick sucker growth at the trunk or graft union.
• soft_ties_stakes – supporting the young trunk and guiding cascading branches.

Pests, Diseases & Troubleshooting

Overview: Mulberries are hardy, vigorous fruit trees with a fairly light pest load, but the ripening fruit draws birds, fruit flies and mealybugs, and the tree can develop bacterial blight, leaf spots, popcorn disease and, in wet or old soil, root rots. Most management is cultural and about protecting fruit; sprays are seldom needed on an established tree.

Quick Troubleshooting Overview

Issue / Pest	Main Symptom	Primary Solution
Birds	Fruit stripped or pecked as it ripens	Netting, decoys, early harvest, sacrificial trees
Fruit fly	Maggoty, softening fruit that drops	Bag or net fruit, traps, sanitation
Mealybugs / scale	White fluff or bumps on stems, sooty mold	Wash off, horticultural oil, control ants
Bacterial blight	Angular black leaf spots, blackened shoots	Prune out, copper, avoid overhead wet
Popcorn disease	Swollen, popcorn-like distorted fruit	Remove and destroy affected fruit, sanitation
Fruit staining / mess	Stained paving and self-seeding under tree	Site away from paving, choose fruitless types

Common Pests & Management

• Birds ((various)):
  • Symptoms: Ripening berries are stripped, pecked or dropped as birds feed heavily on the sweet fruit; the single biggest cause of crop loss on mulberries.
  • Prevention & Control: Net small trees as fruit colors, use reflective tape, decoys or noise deterrents, harvest promptly and often, and accept that a large tree usually yields enough to share; some grow mulberries as a decoy to protect other fruit.
• Mediterranean / fruit fly (Ceratitis capitata / Bactrocera spp.):
  • Symptoms: Females sting ripening fruit to lay eggs; maggots tunnel inside so berries soften, rot and drop, and the fruit fly builds up on unpicked fruit.
  • Prevention & Control: Harvest frequently, collect and destroy fallen and overripe fruit to break the cycle, hang protein-bait or pheromone traps, and bag or net where practical; garden hygiene is the core control.
• Mealybugs (incl. pink hibiscus mealybug) (Maconellicoccus hirsutus / Pseudococcus spp.):
  • Symptoms: White cottony masses on shoot tips, leaf axils and fruit clusters, causing curled, bunched ‘bunchy top’ growth, honeydew and sooty mold; pink hibiscus mealybug can seriously distort growth.
  • Prevention & Control: Prune out and destroy heavily infested bunched shoots, wash off colonies, apply horticultural oil, and control the ants that protect them; introduced parasitic wasps and ladybugs give good biological control.
• Scale insects (Pseudaulacaspis / Coccus spp.):
  • Symptoms: Bumps and encrustations on bark and twigs with honeydew and sooty mold, weakening branches.
  • Prevention & Control: Scrape off light infestations, apply horticultural or dormant oil, and prune out heavily encrusted wood; encourage natural enemies and manage ants.
• Spider mites and thrips (Tetranychus / Frankliniella spp.):
  • Symptoms: Mites stipple and bronze leaves in hot, dry weather; thrips scar leaves and fruit surfaces.
  • Prevention & Control: Rinse foliage, avoid drought stress, and treat only heavy infestations with horticultural oil or insecticidal soap.

Diseases & Fungal Issues

• Bacterial blight / leaf scorch (Pseudomonas syringae pv. mori):
  • Symptoms: Angular, water-soaked to black spots on leaves with yellow halos, blackened blighted shoot tips, and distorted young leaves in cool, wet springs.
  • Treatment & Management: Prune out blighted shoots in dry weather with sterile tools, avoid overhead watering, and improve airflow; a copper spray at bud break helps in wet climates and remove fallen debris.
• Popcorn disease (Ciboria carunculoides):
  • Symptoms: Individual fruitlets swell and elongate into hard, distorted ‘popcorn’ shapes that fail to ripen normally, the fungus overwintering on fallen fruit.
  • Treatment & Management: Remove and destroy all affected and fallen fruit to break the cycle, rake up debris, and mulch; sanitation is the main control and severity varies year to year.
• Leaf spot (Cercospora / Phloeospora / Pseudocercospora spp.):
  • Symptoms: Brown to purple angular spots that can merge and cause early leaf yellowing and drop in warm, humid weather.
  • Treatment & Management: Rake and remove fallen leaves, improve airflow, and avoid overhead watering; a copper fungicide can be used on young trees if defoliation is heavy.
• Root and crown rot (Armillaria / Phytophthora spp.):
  • Symptoms: Decline, dieback, and white fungal fans or mushrooms at the base (Armillaria) or soft dark roots (Phytophthora), in wet, heavy or previously wooded soil.
  • Treatment & Management: Plant in well-drained soil away from old tree stumps, avoid trunk waterlogging, and remove severely affected trees with their roots; there is no cure once established.
• Powdery mildew (Phyllactinia / Erysiphe spp.):
  • Symptoms: White powdery growth on leaf undersides in late season, usually cosmetic.
  • Treatment & Management: Improve airflow and tolerate late-season mildew; a sulfur spray is rarely necessary.

Growing Difficulties & Abiotic Problems

• Fruit staining and mess:
  • Cause & Symptoms: The soft, dark, juicy fruit stains paving, cars and clothing and self-seeds via birds.
  • Correction Strategy: Site trees away from paving, paths and parking, plant fruitless or lighter-fruited cultivars where mess is a concern, and harvest or clear dropped fruit.
• Sooty mold and sticky honeydew:
  • Cause & Symptoms: Honeydew from mealybugs and scale coats leaves and anything below with sticky black sooty mold.
  • Correction Strategy: Control the underlying sap-suckers and their ants; wash foliage and surfaces, and the sooty mold clears once honeydew stops.
• Sunburn and vigorous suckering:
  • Cause & Symptoms: Exposed bark can scald and the vigorous tree throws suckers and heavy growth.
  • Correction Strategy: Whitewash or shade exposed trunks after hard pruning, and remove suckers and prune to shape in the dormant season.

What Helps — Products & Tools

Most mulberry care is protection and hygiene rather than spraying. Keep fruit netting and protein-bait or pheromone fruit-fly traps for the fruit, horticultural or dormant oil for mealybugs and scale, ant baits to break the ant-mealybug link, and a copper fungicide for bacterial blight and leaf spot. Sanitation, removing fallen fruit, is the key against popcorn disease and fruit fly alike.

Propagation Guide

Weeping mulberry is normally propagated from hardwood cuttings for own-root plants, but the cascading, umbrella-like standard form widely sold in nurseries is commonly produced by top-grafting weeping scion wood onto an upright mulberry rootstock trunk. Seed is easy to germinate but is not recommended, since it will not reliably reproduce the weeping habit; difficulty is easy for cuttings and specialist for grafted standards.

Quick Propagation Specs

Best Propagation Method	Hardwood stem cuttings (own-root plants)
Alternative Methods	Top-grafting onto upright mulberry rootstock (for standard/tree-form specimens); seed (not recommended)
Propagation Difficulty	Easy (cuttings); Specialist (grafted standards)
Seed True-to-Type	No – the weeping habit is not reproduced from seed
Vegetative True-to-Type	Yes
Best Propagation Season	End of winter to early spring
Seed Germination Time	1–7 weeks
Cutting Rooting Time	3–4 weeks
Seed Sowing Depth	1 cm

Growing from Seed

Seed Handling & Viability

Clean the seed of fruit pulp, then dry it and store in a cool place until sowing.

Dormancy & Pre-Sowing Treatment

A brief chilling period (around 5°C/41°F or a little colder, not prolonged) is used before sowing.

Sowing Season

Bury the seed in winter; germination follows into spring.

Sowing Depth & Orientation

About 1 cm deep.

Germination Conditions

Moist soil in full sun, with average watering.

Germination Time

1–7 weeks.

Seedling Care

Keep moist, in full sun, with generous watering; note seedlings will not weep like the parent.

Stem Cuttings

Cutting Type

Hardwood cuttings, taken while the branch is still dormant, before it grows leaves.

Best Timing

End of winter to early spring.

Cutting Preparation

Take cuttings before leaf-out.

Rooting Setup

Root in half shade or light, keeping the medium moist with generous watering.

Rooting Hormone

Not specified by the site; optional, and can improve rooting consistency.

Rooting Time

3–4 weeks.

Grafting & Budding

Why Grafting Is Used

To build the characteristic weeping, cascading crown on top of an upright trunk (a “standard”), a form that cutting-grown plants alone do not reliably develop. This is not documented in the site’s own facts but reflects standard nursery practice for weeping mulberry.

Preferred Grafting Methods

Whip-and-tongue or top/cleft grafting of weeping scion wood onto an upright mulberry rootstock, usually at the desired trunk height.

Best Grafting Season

Dormant season, end of winter to early spring, matching the site’s own cutting and planting timing.