New Bud-Thinning Technique for Chrysanthemum Growing: Master the Method for Bigger, More Uniform Blooms

A chrysanthemum branch often bears several flower buds at the same time. If all of them are allowed to develop, the nutrients will be spread thin, so each flower will not grow large and the ornamental effect will be uneven. Bud thinning means promptly removing the surplus buds and concentrating nutrients on the main bud that is kept, so the flowers bloom larger, fuller and more uniform. This is an important step in chrysanthemum growing for improving flower quality.

The key to bud thinning lies in getting the timing right. It is usually best to wait until the buds have grown to the size of a soybean and the main bud and side buds can be clearly distinguished; thinning too early makes it hard to tell main from secondary, and thinning too late means the side buds have already consumed a good deal of nutrients. The operation should be done on a sunny morning, when wounds heal quickly and there is less chance of infection by pathogens.

In practice, you can pinch the base of a side bud with your fingers and gently snap it off, or cut it off with small sterilised scissors; the movements should be gentle so as not to bruise the main bud and the surrounding leaves. It should be noted that not all chrysanthemums are kept to a single bud. For spray chrysanthemums and some cut-flower varieties, in order to form a full overall effect, some side buds are moderately retained, and only the overly dense, weak and poorly positioned buds are removed. How many to keep depends on the cultivation purpose and the characteristics of the variety.

After bud thinning the plant's burden is reduced, and a top dressing of fertiliser based mainly on phosphorus and potassium can be applied to promote the swelling and blooming of the main bud. At the same time, keep the potting soil moist and the environment well ventilated and well lit, and watch for common pests and diseases such as aphids and powdery mildew to prevent the buds from being damaged. Only then can the effect of bud thinning be fully realised, and the plants finally produce large, uniform flowers.