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Plant care

Shagbark manzanita (Woolly manzanita) care

Arctostaphylos tomentosa

Also called Shagbark manzanita, Woolly manzanita.

RHS H4USDA 8-10Pet-safeIndoor 1–3 m tall (3–10 ft)

Watering rhythm

3-4weeks

Every 3–4 weeks once established; more frequent during the first 2 years

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Light

Direct sun (at least 4-6 hours)

Soil

Sandy or gravelly, well-drained, acidic loam

Humidity

Low to moderate (20–50% RH)

Temp

−5 to 35°C

Pet safety

Pet-safe

Mature size

1–3 m tall (3–10 ft)

Care at a glance

Light

Most houseplants will scorch where shagbark manzanita thrives. Give it the windowsill you'd otherwise leave empty because everything else burned there. Requires full sun — at least 6–8 hours of direct sunlight daily. Will become leggy and poorly-flowering in shade. Full exposure promotes the dense habit and bark coloration characteristic of the species. A plant moved abruptly from low light to direct sun bleaches in 48 hours — always acclimatise over a week.

Watering

Aim for every 3–4 weeks once established; more frequent during the first 2 years for shagbark manzanita, but treat that as a starting point rather than a rule. A south-facing summer windowsill will dry the pot twice as fast as a north-facing winter room. Lift the pot; if it feels noticeably lighter than it did wet, water it. Extremely drought-tolerant once established. In summer (its dry season) water deeply but infrequently. Overwatering is the primary killer — avoid irrigation in summer once plants are mature. Winter rains are typically sufficient in its native range.

Soil and pot

Shagbark manzanita grows best in sandy or gravelly, well-drained, acidic loam. Must have excellent drainage. Prefers slightly acidic soil (pH 5.5–6.5) low in nutrients. Heavy clay or organically rich soil causes root rot. Do not amend with compost or fertilizers at planting — leanness is key. A pot with a working drainage hole is non-negotiable for this species — even free-draining mix will turn soggy in a closed planter. If you love the look of a decorative pot without a hole, use it as a cachepot around an inner nursery pot you can lift out to water.

Humidity and temperature

Shagbark manzanita sits happiest at around Low to moderate (20–50% RH) humidity and −5 to 35°C (23 to 95°F). Adapted to the dry, low-humidity conditions of California chaparral. Does not require supplemental humidity and actually suffers in persistently humid or wet conditions, which promote fungal disease. If you keep the room above −5 to 35°C year-round and avoid placing the plant near a cold draught, a hot radiator, or an air-conditioning vent, you have already handled the two biggest indoor stressors.

Fertilising

Feed shagbark manzanita sparingly. Do not fertilize. Manzanitas are adapted to poor soils and fertilizer application — especially nitrogen — promotes weak, disease-prone growth. Native soil lean in nutrients is preferred. Skip fertiliser entirely on a stressed, recently-repotted, or actively wilting plant — fertiliser salts make damage worse, not better. Wait for a round of healthy new growth before resuming a feeding rhythm.

Common problems

Below are the issues we see most often on shagbark manzanita in the Growli community. Each is annotated with the most common cause so you know where to start.

  • Root rot (Phytophthora) — The most common and fatal problem. Caused by summer irrigation or heavy clay soils. Leaves yellow, then brown, and the plant rapidly collapses. Ensure excellent drainage and stop all summer watering once established.
  • Leaf gall (Exobasidium) — A fungal pathogen that causes pale, waxy, distorted leaf galls in spring. Remove and destroy affected tissue. Improves airflow by pruning out crowded interior branches. Generally not fatal.
  • Poor flowering / leggy growth — Usually caused by insufficient sun or overly rich soil. Ensure full sun exposure and avoid fertilizing or heavily amending planting soil. Thin lightly after flowering to maintain shape.

Propagation

Semi-hardwood stem cuttings taken in late summer are the most reliable method; wound the base, apply rooting hormone, and root in a gritty, well-draining mix. Seed propagation requires stratification and scarification but is successful; layering also works. Cuttings are preferred for named selections. Propagation is the cheapest, most satisfying way to expand a collection — and it doubles as insurance against losing a mature plant to an accident. Take a backup cutting once the parent is established and healthy.

Toxicity to pets

Shagbark manzanita is pet-safe. Arctostaphylos (manzanita) is not listed as toxic by the ASPCA. The berries have a long history of use in Native American food traditions. No toxic principle is known for dogs or cats; the genus is not individually ASPCA-listed but has no reported toxic principle. If you keep cats, dogs, or curious children in the house, weigh placement carefully — a high shelf or a hanging planter is enough for casual safety. For severe ingestion incidents, call your local vet and the ASPCA Animal Poison Control Center (in the US, 888-426-4435).

Pet-safety status is sourced from the ASPCA Toxic and Non-Toxic Plant List, which catalogues the most-asked-about plants for cats, dogs, and horses.

Shagbark manzanita care — frequently asked questions

What is the common name for Arctostaphylos tomentosa?

Arctostaphylos tomentosa is most commonly called Shagbark manzanita, but it is also known as Shagbark manzanita, Woolly manzanita. The names refer to the same species, so care instructions for Shagbark manzanita apply identically to anything sold as Woolly manzanita.

How much light does shagbark manzanita need?

Shagbark manzanita grows best in direct sun (at least 4-6 hours). Requires full sun — at least 6–8 hours of direct sunlight daily. Will become leggy and poorly-flowering in shade. Full exposure promotes the dense habit and bark coloration characteristic of the species.

How often should I water shagbark manzanita?

Water shagbark manzanita every 3–4 weeks once established; more frequent during the first 2 years. Extremely drought-tolerant once established. In summer (its dry season) water deeply but infrequently. Overwatering is the primary killer — avoid irrigation in summer once plants are mature. Winter rains are typically sufficient in its native range. The finger-test (or lifting the pot to feel its weight) beats a fixed weekly calendar because pot size, light, and season all change how fast the soil dries.

Is shagbark manzanita toxic to cats and dogs?

Shagbark manzanita is pet-safe. Arctostaphylos (manzanita) is not listed as toxic by the ASPCA. The berries have a long history of use in Native American food traditions. No toxic principle is known for dogs or cats; the genus is not individually ASPCA-listed but has no reported toxic principle.

What USDA hardiness zone does shagbark manzanita grow in?

Shagbark manzanita is rated for USDA zone 8-10 and RHS hardiness H4. Outside that range, grow it as a container plant that overwinters indoors before the first hard frost.

Shagbark manzanita deep-dive guides

Every aspect of shagbark manzanita care, each with its own calibrated guide:

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Shagbark manzanita qualifies for 11 curated Growli shortlists — each one filtered objectively from our structured plant-care library, so the selection is consistent and checkable:

Related guides

Shagbark manzanita is also commonly called Shagbark manzanita or Woolly manzanita.