Regardless of soil type, good drainage is a must for tree health. Crabapples grow best in a moist, slightly acidic soil with a pH of 5.0 to 6.5. Excessively moist areas and low spots should be avoided. On the other hand, relatively dry sites can be tolerated by crabapples if plant stresses are minimized during the first year after transplanting. Drought stress, for example, is due to a lack of water, either from rainfall or irrigation.
Water is essential for every life function of the plant.
However, too much water or over-watering, a persistent saturation of the roots, can lead to root rot and eventual plant death. Other plant stresses include too much shade, insect damage, infectious diseases, and physical damage from lawnmowers, weed-eaters, animals, and children playing. Most flowering crabapples are hardy in Ohio and can endure the colder temperature extremes of zone 4 on the USDA Plant Hardiness Zone maps. Planting and Establishment Tree health and vigor depends upon proper site selection and preparation. Before planting, have the soil tested to assure proper pH and nutrient levels.