Raise geraniums skillfully in autumn

After the hot summer, the natural sunflower, which is in a semi-dormant state, begins to recover gradually, growing leaves and blossoming again, adding color to the golden autumn. However, it is inevitable that the geranium, which has just passed through the hot summer, is undergrown because of its old roots and leaves. The newly extracted leaves are small and dark green, the petioles and inflorescence stalks are short, the bouquet is small, and the whole plant shape is clustered, which reduces the ornamental value. The treatment of geranium with gibberellin can effectively promote the blooming of leaves and flowers and improve the ornamental value. The method is that when the inflorescence stalk of the first batch of flowers changes from curved to erect after the growth of the geranium plant is restored, that is, when the branches of the new shade hair expand 34 leaves, spray the whole plant with 500ppm gibberellin solution, once. This method is not only suitable for perennial old plants, but also has a better effect after cutting seedlings in spring of the same year. After treatment, the length of petiole was 10 12cm, the length of inflorescence stalk was 15 20cm, the longest was 24cm, the length of inflorescence stalk was 7.10 cm, the length of single flower stalk was 3 5cm, while that of control was only 2cm. The length and width of petals can be increased by 0.5cm, but the shape, number and color of petals are not affected. The leaves changed significantly to tender green, and the size was basically unchanged.

Because of the umbels or Cymes of the genus Pelargonium, the number of florets is numerous, overlapping clusters into globose inflorescences. The size of the bouquet does not depend on the number of flowers, but mainly on the size of a single flower and the length of the flower stalk. As the single flower stalk increased, the treated flower bulb became significantly larger. Some varieties of Cymes, such as purple hydrangea, lotus, etc., can reach 15c in diameter and up to 20cm. Some varieties of umbels, such as peach blossom noodles, Danlu powder, etc., because there is no secondary inflorescence stalk, the growth of the bouquet is less, but it can also reach more than 10c. In addition, because the growth of inflorescence stalk is the most significant (generally 11.5 times that of the control), the flower bulb towers above the leaves, graceful, very bright and eye-catching, so it is more suitable as a cut flower.

The only disadvantage of gibberellin-treated geranium is that the top of the branch becomes thinner and weaker, and then lengthens the leaves of the branch, which makes the plant tend to be loose. The method of adjustment is that within a week after treatment, a leaf is cut off from the thin and weak tip above the inflorescence, and a well-developed lateral bud will sprout and branch in the axil of the first leaf under the inflorescence. Since the lateral buds germinated after a week of gibberellin treatment, the branches were as strong as before. When the treated inflorescence is in full bloom, the new branch has also budded and can still be treated with gibberellin again, so repeatedly, the geranium blossoms luxuriantly and the ornamental value increases greatly.