This very hardy plant makes an excellent Bonsai with its conical shape and upright nature lending itself well to Formal Upright medium and large Bonsai. It is extremely hardy and tolerant to Zones 2/3.
Formal upright, Informal Upright, Slanting, Semi-cascade, Group planting, Saikei
Full sun, but needs shade from the midday sun in summer, or needle browning will result. These northern trees prefer cool temperatures, although small or young bonsai may need frost protection.
Spruces prefer moisture, but not waterlogged soil. Reduce watering in winter, but never allow the soil to dry out completely.
Every two weeks, spring to autumn, using liquid bonsai food or half-strength general purpose fertilizer. In hot areas, discontinue feeding during the heat of summer. Apply a chelated iron supplement several times yearly.
Leaf and Branch Pruning:
New growth should be pinched, not clipped, several times in spring, when shoots are about 1 inch long, leaving 3-4 needles per clusters.
Re-potting & Growing Medium:
Repot young trees every 3-4 years. Trees 10 years and older should only be re-potted every 5-6 years. Prune between early to mid-spring before new growth expands, or in early fall. Prune roots by no more than a 1/3 as spruce need a relatively larger root ball and need like to be planted in deeper pots to achieve this. After repotting best to pace out of direct sunlight for a few weeks while roots and plant settle down. Use fast-draining soil mix, 1 part Loam, 1 part peat, 2 part sharp sand. (2 parts Kiryu and 1part Leaf Mold orBark Chips)
Wire between late autumn and winter.