Rimu (Dacrydium cupressinum)

Rimu

Dacrydium cupressinum

Needles drape like soft green curtains, a towering ancient conifer. Evergreen coniferous tree; common name: rimu, red pine.

Partial sun
1–2/week
Moderate
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Plant Needs

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Sunlight Full sun to partial shade; young saplings tolerate dappled forest shade in native habitats
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Watering Water deeply but infrequently; allow top 5–10 cm of soil to dry slightly between waterings to avoid root rot
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Temperature Hardy to mild frosts; prefers cool temperate climates and avoids prolonged temperatures above 28°C
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Characteristics

  • Leaf: Juvenile leaves are linear, 10–20 mm long; adult leaves scale-like, overlapping, 1–3 mm long
  • Cones: Male cones are small, yellow, clustered at branch tips; female cones produce a single seed with a fleshy red aril
  • Stem/Bark: Bark is reddish-brown, peeling in thin, fibrous strips as the tree ages
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Care Guide

Watering

Keep soil consistently moist for young saplings; reduce watering frequency for mature established trees

Fertilization

Apply slow-release organic fertilizer once at the start of growing season. Use a low-nitrogen fertilizer to support steady, slow growth without forcing excessive foliage production

Composted leaf mold:Work fully composted leaf mold into the top 5 cm of soil annually to improve soil structure and nutrient availability; avoid raw, uncomposted material to prevent pest infestations
Pruning
  • Remove dead, damaged, or crossing branches in late winter to maintain tree structure and airflow
  • Avoid heavy pruning, as rimu grows slowly and recovers poorly from severe cutting
  • Thin crowded lower branches on young saplings to promote upward growth and reduce shade stress
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA does not list this plant as toxic to cats

Humans: No known toxic effects on humans

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Garden Uses & Culture

Culture: N/A

Usage: Timber for construction and woodworking; ornamental landscape tree in suitable climates