Acer Rubrum

Hardiness zones 4-9, (-32°C/-25°F,-5°C/25°F) in Winter. Grow in full sun to part shade. In nature, it grows near stream and pond banks, mesic forests, swamps and sometimes drier uplands. Being a wetland tree by preference, the Red maple will survive in, and may even prefer, a heavier, more water-retaining soil than other maples. Do not keep Red maples in water except during the hottest part of the Summer, above 95°F. Water copiously during the warm months, especially if the soil does not hold water. In hot climates keeping the tree in a shallow tray of water may be necessary. They will, do quite well in a normal bonsai soil. Fertilize weekly, beginning in early Spring; bi-weekly in Fall until leaves begin to turn. Use a well-balanced fertilizer (10-10-10). Germination For faster germination, soak the seeds in slightly hot water for 24-48 hours, followed by 3 months cold stratification before sowing at 1/3" deep in sterile gardening soil. Keep damp soil, not soaking wet. Keep pot in warm situation 68-75°F. Germination usually occurs in one to two months. It can be a lot more depending on their degree of unbroken dormancy, don't lose faith. Cold stratification This will break their dormancy. It creates a cold and moist environment for the seeds. Mixed in seeds with slightly moistened vermiculite or peat, only damp in a ziplock bag. Close zip bag shut and store it in the salad crisper compartment of your refrigerator. If any seeds begin to sprout during the cold stratification, simply remove the seed and plant.