Bonsai Training Information

Pinus densiflora
Japanese Red Pine

Closely related the Scots pine with its reddish brown bark it has become a popular ornamental and has several cultivars. The height of this tree is between 20 and 35 meters. The Japanese red pine prefers full sun on well-drained, slightly acidic soil. Widly cultivated in Japan, as an ornamental and timber tree it also has strong ties in formal Japanese Gardens. It is not surpring that is also very popular as a Bonsai too.


Formal upright, Informal Upright, Slanting, Cascade, Semi-cascade, Literate, Rock-over-root, Clasped-to-rock, Twin-trunk, Clump, Group planting, Saikei




Full Sun to Partial Shade, protect from Frost in Cooler months.


Water regulary but do not water-log soil, only water when the surface of the soil has dried out a bit. Reduce watering in winter, but never allow the soil to dry out completely. Misting is appreciated between spring and autumn.


Every two weeks, spring-mid autumn, use a low yield general purpose fertilizer. In hot areas, discontinue feeding during the heat of summer. Apply a chelated iron supplement several times yearly as the plant prefers an acidic soil.

Leaf and Branch Pruning:

New growth should be pinched, not clipped, several times in spring, when shoots are about 1 inch long, leaving only 2-3 clusters of needles. Do major pruning in early fall. Never remove all needles.

Re-potting & Growing Medium:

In general, every 3-4 year in early to mid-spring, before new growth expands, or in early fall. Older specimens (+10 years) may be repotted every 5 years. Prune roots by upto a 1/3. Use fast-draining soil mix, 30% Loam, 30% peat, 30% sand. Protect from full sun for a few weeks after repotting.


Wire between late autumn and winter.


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