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Most fruit trees are sited for sun and drainage, and mulberries want those too. But a mulberry has a second requirement that outranks both: nothing you care about may sit under the drip line. For four to six weeks in summer the tree sheds ripe and over-ripe fruit continuously, and the juice is a genuine dye. On porous concrete, pale paving, decking and car paint it sets within hours and does not come out with pressure washing. Birds that have eaten the fruit spread the same stain thirty feet (9 m) beyond the canopy in droppings.
You cannot fix this later by moving the tree. A three-year-old mulberry already resents transplanting, and a mature one is immovable. Spend an afternoon standing where you plan to plant, imagine a canopy twenty to forty feet (6 to 12 m) across, and check what is inside that circle: the path to the door, the washing line, the parking space, the neighbor's driveway, the seating area, the dog's usual route indoors.
| Surface under the canopy | Verdict | Reason |
|---|---|---|
| Rough grass or meadow | Ideal | Fallen fruit disappears, mowing clears the rest |
| Bare soil or bark mulch | Good | Stains are invisible and fruit rots away |
| Fine lawn near a door | Risky | Juice tracks indoors on shoes and paws |
| Paving, decking, concrete | Avoid | Purple staining is effectively permanent |
| Parking, washing line, patio table | Avoid | Fruit and bird droppings fall for weeks |
If your only sunny spot is paved, grow the tree in a large container or as a fan against a wall with a strip of bare soil or gravel beneath. A pot-grown tree can be moved to an out-of-the-way corner for the weeks it is dropping fruit.
Sun, shelter and soil
Give the tree full sun, six to eight hours or more. Mulberries fruit in part shade but the crop is smaller and the flavor thinner, because sugar comes from accumulated heat. Shelter matters less than with most fruit; mature trees stand up to wind well, though young whips need a stake for the first two or three years.
The tree is unfussy about soil type and tolerates clay far better than most fruit trees, but it will not accept standing water. Look at the site after heavy rain: if puddles sit for more than a few hours, plant on a raised mound eight to twelve inches (20 to 30 cm) high rather than trying to improve the hole. A pH anywhere between 5.5 and 7.5 is fine, so soil testing is rarely worth the trouble here.
Getting a young tree into the ground
Plant while the tree is dormant and leafless, from leaf fall to just before bud break. Mulberry roots are brittle and bleed sap readily, so handle them gently and do not shorten them to fit a mean hole.
- Dig wide, not deep Make the hole two to three times the width of the root ball but no deeper than it. Loosen the sides with a fork so roots are not trapped in a glazed pit, especially in clay.
- Match the old soil line Set the tree so the point where the roots flare out sits level with the surrounding soil. Planting deep is a common cause of slow decline in the first few years.
- Backfill with the soil you dug out Do not fill the hole with compost. A rich pocket in poor ground keeps roots circling inside it instead of running out. A single bucket of compost mixed through the backfill is the most you need.
- Stake low and loose Drive a short stake at an angle clear of the root ball and tie at about eighteen inches (45 cm). A low tie lets the trunk flex and thicken. Remove the stake after two to three years.
- Water in and mulch Give five to ten gallons (20 to 40 L) to settle the soil, then mulch two to three inches (5 to 8 cm) deep over the root zone, keeping a hand's width clear of the trunk.
The first two summers
Establishment is the only period when a mulberry is genuinely demanding of water. Through the first two growing seasons soak the root zone deeply once a week in dry weather rather than sprinkling often; five to ten gallons (20 to 40 L) delivered slowly is worth more than daily wetting of the surface. Keep a three-foot (90 cm) circle around the trunk free of grass, because turf competing at the surface slows a young tree more than any drought.
Do not feed heavily. A mulberry pushed with nitrogen makes long soft shoots that ripen poorly and are the first thing to be damaged by cold. Expect little or no fruit for the first two or three years from a young grafted tree, and longer from a seedling. This is normal and is not a sign that anything is wrong.
What to write down at planting
A tree you will keep for forty years deserves two minutes of record-keeping. Note the planting date, whether the tree was bare-root or containerised, exactly where it sits relative to a fixed point such as a corner of the house, and how far the nearest paving is. In five years, when the canopy has spread and the first heavy crop starts falling, that measurement tells you whether you need to reduce the branches on one side or simply accept the stain.
Also record the date the first fruit ripened each year and the date the last fruit dropped. Those two dates are the tree's own calendar, and after three seasons they let you plan around the messy weeks: when not to park underneath, when to take the washing line down, and when to have a sheet ready.