Thimbleberry

Sun

Partial shade to full sun; afternoon shade is helpful in hot or dry gardens.

Water

Moderate; keep the root zone evenly moist while establishing and during flowering and fruiting. Established plants tolerate some seasonal dryness, but fruit production suffers.

Soil

Humus-rich, well-drained soil that holds moisture; tolerates clay if it is not waterlogged. Slightly acidic to neutral soil is ideal.

Height

3-8 ft (0.9-2.4 m)

Spread

4-8 ft (1.2-2.4 m) initially; spreading colonies can become much wider.

Flowers

Late spring to early summer; white, five-petalled flowers in small clusters.

Foliage

Large, softly hairy, maple-shaped leaves with three to five lobes; usually yellow in autumn.

Growth

Fast once established, with vigorous underground spread.

Care needed

Medium

• Pollinators
• Cold hardy
• Wildlife
• Low allergen
• Edible

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

Difficulty

Moderate

Toughness

Very tough

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

1. Planting day

   1.6 ft (0.5 m)

2. After 1 year

   2.8 ft (0.85 m)

3. After 2 years

   4 ft (1.2 m)

4. After 3 years

   5 ft (1.6 m)

5. After 5 years

   5 ft (1.7 m)

   full size

About 3 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

Safe

Native to

the US and Canada

In the garden

Spreads vigorously: plan to contain it.

Growth rate

Fast

• Water deeply during dry spells for the first two growing seasons and whenever fruit is developing.
• Apply 2-3 in (5-8 cm) of leaf mould or composted bark in spring, keeping it clear of the stems.
• On reasonably fertile soil, use an annual compost dressing rather than high-nitrogen fertiliser.
• Remove unwanted suckers with their attached roots before they establish beyond the planting area.
• Give plants space for air movement and avoid planting them in permanently wet ground.

Pruning. After harvest, cut canes that have fruited down to ground level, keeping healthy new canes for next year's crop. In late winter, remove dead, damaged or crowded stems.

Pick berries in summer when they are fully red, soft and slip easily from the central core, leaving a hollow, thimble-shaped fruit. Handle gently and eat or process promptly because they crush easily; expect a first worthwhile crop about 2-3 years after planting, although yields vary considerably.

Autumn

Plant while the soil is workable and moist, allowing room for a spreading colony.

Late winter

Remove dead or damaged canes and thin crowded growth.

Early spring

Lift rooted suckers for propagation and remove those spreading into unwanted areas.

Spring

Apply compost and renew mulch before the soil dries.

Late spring

Water during dry weather as flowers open and fruit begins to form.

Summer

Harvest ripe berries frequently and cut out spent fruiting canes after cropping.

• Plant along a roomy woodland edge, where its broad leaves contrast with ferns.
• Use as an informal deciduous screen beneath widely spaced trees.
• Include in a food forest with currants and other shade-tolerant fruiting shrubs.
• Grow in a North American native wildlife border where suckering growth can form cover.

Garden styles it suits: Woodland, Wildlife garden, Pacific Northwest woodland, Food forest, Edible landscape and Rewilded.

Plant it with: Western sword fern, Vine maple, Red-flowering currant, Oregon grape and Goatsbeard.

Wildlife: Flowers provide pollen and nectar for insects, including native bees. Birds and mammals eat the berries, and established colonies provide shelter.

• Unwanted suckering: dig out shoots with their connecting roots and check the planting boundary each spring.
• Powdery mildew: thin crowded canes, maintain soil moisture and avoid very dry, enclosed sites.
• Leaf scorch and poor fruiting in heat or drought: provide afternoon shade, mulch and water deeply.
• Cane dieback: cut affected canes back to healthy tissue or ground level, remove the debris and improve drainage if the soil stays wet.

Not known to be toxic to people, cats, dogs or horses. The ripe berries are edible; the leaves, stems and roots are not usual foods, and reliable livestock-feeding information is limited.

Where it spreads. Spreads aggressively by underground rhizomes, particularly in moist gardens in its native western and northern United States and Canada. Allow a dedicated patch and remove unwanted suckers; vigorous garden spread does not by itself mean the species is officially listed as invasive.

• Purple-flowering raspberry (Rubus odoratus)

  Also has thornless stems and broad, lobed leaves, but its flowers are rose-purple rather than white.

• Salmonberry (Rubus spectabilis)

  Usually has prickly stems, leaves divided into three leaflets and pink flowers; ripe fruit may be yellow, orange or red.

• Red raspberry (Rubus idaeus)

  Has compound leaves with three to five separate leaflets, usually pale beneath, rather than one broad, maple-shaped leaf; canes are commonly prickly.

Thimbleberry refers to the hollow, thimble-like ripe fruit, while the Latin name parviflorus means small-flowered.

Propagation. Lift rooted suckers or divide an established clump while dormant, in autumn or early spring. Seed is slower and may need both warm and cold treatment before germination.

Accepted botanical name

Rubus parviflorus

In the US and Canada

Native in Alaska, Canada and the lower 48 states.

Native range

Alaska, Alberta, Arizona, British Columbia, California, Colorado, Idaho, Illinois, Iowa, Mexico Northeast, Mexico Northwest and Michigan.

Measured

Soil pH 4.8 to 7.2. Average height 56 cm.

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