How to grow North American crabapple? Latest cultivation methods explained

The North American crabapple, scientific name American crabapple, is a deciduous small tree of the genus Malus in the rose family (Rosaceae). It is highly resistant, cold-tolerant, tolerant of extremely poor soil, easy to manage, and has good ornamental value. In landscaping it is suitable for row planting along both sides of roads, and can also be planted as a specimen or in groups on lawns or as accents beside rocks and water. Now let us take a look at the cultivation methods for the North American crabapple!

Growth habits of the North American crabapple

The North American crabapple is highly resistant, tolerant of extremely poor soil, and strongly cold-tolerant. It likes sunlight, tolerates drought, and dislikes waterlogging. It grows well in dry areas and is easy to manage. After late autumn, as temperatures gradually drop, its growth is also inhibited, and it then enters a semi-dormant state, with no new branches or tender leaves and few flowers. In northern China, temperatures in January and February are low, sometimes with continuous severe freezing. If household cultivation does not pay attention to keeping warm, the plant may freeze to death, so before frost the potted plant should be moved indoors to a sunny spot. Air humidity and soil pH level regulate the intensity and brightness of the autumn foliage; when rainfall is abundant, the leaf color is more vivid. In summer, give sufficient irrigation to build up plump leaves, and do not let the plant dry out in autumn.

Cutting propagation of the North American crabapple

1. Cutting time: For home cuttings of the North American crabapple, it is best to do it between April and May, when the temperature rises above 20°C. At this time air humidity is high and temperatures are warm, making management simple and suitable for the rapid rooting of the North American crabapple. Wash river sand, dry it in the sun, and place it in a pot. River sand that has been washed and then sun-dried basically achieves the purpose of disinfection, and the sun-dried river sand helps raise the temperature in daytime sunlight, promoting the healing and rooting of the cut surface of the cuttings.

2. Cutting method: Cut strong branches of the North American crabapple, each segment with 3 to 4 nodes, cut the top into a flat-topped shape and the bottom into a horseshoe shape, to expand the contact surface with the sand and promote rooting. Insert the cuttings into a sand pot at a plant-to-row spacing of 3 cm × 4 cm. When inserting, first use a bamboo stick of the same thickness as the cutting to poke holes in the pot sand, then insert the American crabapple branch.

3. After-cutting management: Do not water within 2 days after inserting the North American crabapple, to help the cut surface form a healing callus. On the 5th day, spray-water with water at about the same temperature as the sand, until water is seen flowing out from the bottom of the pot. Place in a cool, shaded place and generally do not water again. In about 10 days, roots of 3 to 4 cm can grow. At this point place the pot in sunlight and water according to the weather. After another 6 to 7 days, it can be potted and planted out.

Cultivation methods of the North American crabapple

1. Soil preparation: The North American crabapple is generally grown in the ground, and can also be potted to make a bonsai. Plant in spring. Because it dislikes waterlogging, it should be planted in a slightly elevated, sunny place that does not easily accumulate water. The soil should be neutral to slightly alkaline, with a pH value not lower than 7. The soil texture should be loose, but not overly fertile, as overly fertile soil easily causes excessive vegetative growth and reduced flowering. The planting hole should be determined according to the size of the root system, and should not be too deep or too large; it is best if it can spread out the root system. The planting depth should preferably be 10 cm from the ground. It is best to plant with a soil ball, and water thoroughly after planting.

2. Light and temperature: The North American crabapple is suitable for growing in an environment with sufficient light, and grows poorly in shaded environments. If growing a potted crabapple tree, place it in a spot with ample light during the growing period. In winter it will not suffer freeze damage even at a low temperature of -15°C, and can overwinter outdoors in the open ground. However, in abnormally cold winters, cold-protection measures are needed.

3. Fertilizer and water management: Watering of the North American crabapple is done together with fertilizing. After leaf fall each autumn, apply 1 heavy fertilizing to replenish the nutrients consumed by flowers and fruit; applying decomposed organic fertilizer is best. At the same time, water in combination with winter irrigation. Before spring buds sprout, apply 1 application of organic fertilizer and give 1 thorough watering. The method of autumn and winter fertilizing varies with tree age: for young trees, apply fertilizer in a ring-shaped trench, with the ring within 100 cm from the tree root; for older trees, dig radial trenches for fertilizing; for very old trees, in combination with inter-row weeding, broadcast organic fertilizer under the canopy, then turn the fertilizer into the ground 30 cm deep. After the flowers fade, apply phosphorus and potassium fertilizer 2 times as a top dressing to ensure a certain fruit-setting rate. At the same time, pay attention to watering.

4. Pruning and shaping: The flower buds of the North American crabapple mostly differentiate from terminal buds, and the main flowering branches are medium and short fruit spurs, so medium and short fruit spurs should be retained. Long branches should be shortened, and at the same time overly dense branches, dead branches, and diseased and pest-infested branches should be cut off, then prune according to the desired tree shape. If you want a full, rounded crabapple canopy, thin out the dense and keep the sparse, cutting away overly dense branches, while for parts with sparse branches, prune downward to encourage more side branches and fill the gaps.