This is one of the most commonly used methods to prolong the flowering period, and the operation is simple. From the middle stage of flowering, cut off the failed or ornamental spikes in time, but keep some leaves to improve the nutritional status of branches and leaves, so that plants can still extract strong branches and spikes in summer. Such as roses, hibiscus, marigold, a bunch of red flowers and so on. After pruning, the flowering period can be extended for a long time. However, some flowers, such as Celosia cristata and Zhu Dinghong, should not use this method, and pruning will reduce the ornamental value.

(2) Delaying planting

Delaying the planting time of flowers or sowing and transplanting in batches can relatively prolong the flowering period. If the seeds of impatiens, marigold, snapdragon and zinnia are sown in batches at different times, the flowers can bloom in turn from late spring to late autumn, and the flowering period can last for half a year. For some bulbous flowers, such as water lily, Zhu Dinghong, freesia, etc. The effect is better, which can make them bloom continuously all summer or even autumn.

(3) Supplementing nutrition

After the full flowering period, topdressing and watering should be done in time to prevent drought and meet the nutrition needed for plant growth and development. For example, a bunch of safflower, which enters its full flowering period from May to June, should be combined with pruning and continue to supplement nutrition in large quantities.

(4) Proper shading

Appropriate shading for flowers or indoors, artificially creating a suitable shading environment, has obvious effects on some heat-resistant flowers. In practice, the above methods can be comprehensively selected according to the growth habits of different flowers.