Japanese Maple Bonsai Winter
When overwintering keep a close eye on your trees.
Japanese maple bonsai winter. Though it will still survive well as long as given adequate winter protection. The sharp s pygmy japanese maple performs well in zones 5 8 and may lose some of its fall brilliance in zone 9. The japanese maple is frost hardy even when trained as a bonsai but it should be protected from strong frost below 10 c 14 f. The japanese maple is a winter hardy outdoor bonsai that means it tolerates temperatures below 0 c well.
Also check your trees for insects and infections regularly. Japanese maple bonsai are typically grown in temperate zones and need a real or simulated winter where they can go dormant in order to survive. Water only when the soil dries out. In frost free weather check the soil for moisture and pour if necessary.
Although this bonsai belongs in the outdoors and needs a dormant period it cannot survive without root protection from frost and heavy wind or in areas where temperatures decline to below freezing for the winter. They develop winter hardiness by being exposed to a pattern of deepening temporary cold like happens overnight in the fall. For this reason these trees are typically outdoor bonsai. There should be a windbreak to prevent the fine branches from drying out for example an unheated greenhouse a foil tent or a sheltered outdoor corner.
Then they will need to accumulate something like 1 000 hours of time below 40f 5c for proper bud break to occur.