Santa Rosa plum

Sun

Full sun, ideally at least 6-8 hours daily; choose a warm, sheltered position away from frost pockets.

Water

Water deeply during establishment and dry spells, especially while fruit is swelling. Keep soil evenly moist rather than saturated.

Soil

Fertile, well-drained loam is ideal; tolerates other soil textures if drainage is good. Avoid waterlogged ground.

Height

15-25 ft (4.6-7.6 m) on a vigorous rootstock; dwarfing rootstocks and pruning keep it smaller.

Spread

15-20 ft (4.6-6.1 m) on a vigorous rootstock; less on dwarfing rootstocks.

Flowers

White flowers in late winter or early spring, before the leaves; timing depends on climate.

Foliage

Green, oval to lance-shaped leaves with finely toothed edges; deciduous, sometimes turning yellow in autumn.

Growth

Moderate to fast when young, slowing as regular cropping begins.

Care needed

Medium

• Pollinators
• Heat tolerant
• Wildlife
• Low allergen
• Edible

Northern hemisphere months. In Australia, shift them by six.

Difficulty

Moderate

Toughness

Fairly tough

Pick your zone, country, light and whether you have pets.

1. Planting day

   7 ft (2 m)

2. After 1 year

   7 ft (2.2 m)

3. After 2 years

   8 ft (2.4 m)

4. After 3 years

   9 ft (2.6 m)

5. After 5 years

   10 ft (3 m)

About 20 years to full size.

From a typical nursery size, at an average rate for this kind of plant. A rule of thumb, not a forecast.

Cats and dogs

Toxic

Growth rate

Moderate

• Water young trees deeply whenever the root zone begins to dry; do not leave roots standing in water.
• Apply a 2-3 in (5-8 cm) layer of organic mulch, keeping it clear of the trunk.
• Feed lightly in early spring if growth is weak; avoid heavy nitrogen feeding that encourages shoots rather than fruit.
• Thin young fruit to roughly 4-6 in (10-15 cm) apart to improve size and reduce branch breakage.
• Keep the graft union above soil level and remove shoots arising below it.
• If crops are poor, check for blossom frost, inadequate winter chilling and the absence of a compatible pollinating plum.

Pruning. Train young trees to an open-centred framework with well-spaced main branches. Prune established trees lightly in dry weather in late spring or summer, removing dead, crossing and crowded growth; avoid autumn and winter pruning where silver leaf and bacterial canker are concerns.

Pick in early to midsummer, depending on climate, when the fruit is red-purple, fragrant and yields slightly to gentle pressure; taste a sample because colour alone is not a reliable guide. Lift and twist ripe fruit gently, harvesting in several passes. Grafted trees commonly give their first worthwhile crop about 3-5 years after planting, depending on rootstock and growing conditions.

Late winter

Plant dormant bare-root trees while soil is workable and not waterlogged; keep the graft above ground.

Early spring

Refresh mulch, feed only if needed, and protect blossom from forecast frost where practical.

Late spring

Thin developing fruit and inspect new shoots for aphids.

Summer

Water during dry spells and pick fruit as individual plums ripen.

Summer

Prune lightly in dry weather, opening crowded growth without stripping out productive branches.

Autumn

Remove fallen and mummified fruit, clear diseased debris and check ties for rubbing.

• Use as a small orchard tree with compatible Japanese-type plums for more reliable pollination.
• Place in a sunny edible garden where spring blossom and summer fruit provide seasonal interest.
• Underplant outside the immediate trunk area with low herbs and flowers, keeping access clear for picking.
• Choose a suitable dwarfing rootstock for a smaller garden, allowing enough room for the mature canopy.

Garden styles it suits: Backyard orchard, Edible landscape, Potager (kitchen garden), Cottage garden, Homestead and Food forest.

Plant it with: Shiro plum, Chives, Sweet alyssum, Yarrow and Creeping thyme.

Wildlife: Flowers provide early pollen and nectar for bees. Birds and some mammals eat ripe fruit; use wildlife-safe, tightly secured netting if protection is needed.

• Brown rot: remove rotting and mummified fruit promptly, thin crowded fruit and prune for airflow; use locally approved treatments if disease is persistent.
• Bacterial canker and silver leaf: prune only in dry spring or summer weather, remove affected branches and avoid unnecessary wounds.
• Aphids: inspect soft shoots, wash off small colonies and encourage ladybirds and other predators; avoid unnecessary broad-spectrum insecticides.
• Little or no fruit: protect blossom from frost, provide a compatible Japanese-type pollinator and check that local winters supply sufficient chilling.

Ripe flesh is edible for people. Leaves, stems and the kernels inside the stones contain cyanogenic compounds and can cause serious poisoning in people, cats, dogs and horses if eaten; wilted foliage is a particular livestock hazard. Stones also pose choking and intestinal blockage risks, so keep fallen fruit and pruning waste away from pets and livestock.

• European plum (Prunus domestica)

  Many European plums have more elongated fruit and flower later than Japanese-type plums, but these features overlap; a reliable label is needed for certainty.

• Cherry plum (Prunus cerasifera)

  Usually bears much smaller, round fruit and flowers very early; purple-leaved ornamental forms are common.

• Other Japanese plum cultivars (Prunus salicina cultivars and hybrids)

  Several have similar red-purple fruit and white blossom. Fruit flavour, ripening season and flesh colour help, but appearance alone cannot reliably confirm Santa Rosa.

The cultivar name refers to Santa Rosa, California, where plant breeder Luther Burbank developed it.

Propagation. Propagate by budding or grafting onto a compatible plum rootstock. Seedlings will not reliably reproduce Santa Rosa fruit or growth, and rootstock suckers are not the named cultivar.

Accepted botanical name

Prunus salicina

Native range

China North-Central, China South-Central, China Southeast, Khabarovsk, Manchuria, Primorye, Taiwan and Vietnam.

Measured

Average height 800 cm.

Sources: GBIF (CC BY 4.0) and Trefle (CC BY 4.0). The care and design notes are LandscapeGPT's own.