The promoting effect of Paclobutrazol on the flowering of potted roses
A comprehensive explanation of the knowledge about roses, the promoting effect of Paclobutrazol on the flowering of potted roses, the specific contents are as follows:
Due to the tall plant height of roses, they are generally planted in the ground. If potted, they often suffer from poor growth due to water and fertilizer limitations, resulting in fewer flowers. In order to control the height of potted roses, the author used Paclobutrazol for dwarfing and unexpectedly discovered that Paclobutrazol also has a good promoting effect on flowering.
Specific operation methods are as follows:
In winter, when the roses start to dormant and shed leaves but new buds have not germinated yet, cut the branches 10-15 cm away from the base, remove the central branches and sickly branches that occupy the inside, and leave the strong branches to form a bowl shape extending in all directions. In the following spring, when new buds germinate, remove all buds below 5 cm high and buds growing inward, leaving only the strong buds at the top of the branches growing outward and upward as flowering branches. When the buds grow to 5 cm, bury 50g of bone meal in the upper layer of potting soil, and start to water the potting soil with a 500-fold Paclobutrazol solution one week later, once a week, for three consecutive times, which can control the height of new branches to about 15-30 cm, similar to ordinary cultivated roses. When the temperature rises to 18-23℃, roses treated with Paclobutrazol start to differentiate flower buds about two weeks earlier than untreated roses. Increase the supply of nutrients during the period from when the flower bud shape is just recognizable to when it opens. Apply fertilizers with appropriate nitrogen, phosphorus, and potassium ratios in the early growth stage to promote strong flowering branches and larger flowers. In the later stage, apply phosphorus and potassium fertilizers mainly to make the flowers more colorful and fragrant. At the same time, if you spray a mixture of 0.5% urea, potassium dihydrogen phosphate, and boric acid solution once a week, it can make the flower buds plump, petals larger and thicker, bright red and glossy, and the fragrance stronger.
According to the author's analysis, the reason why Paclobutrazol can promote flowering in roses is mainly due to the controlled plant height and the basic cessation of vegetative growth, so most of the nutrients are concentrated in the supply of flower development, thus greatly improving the number and quality of flowers. In terms of flower yield alone, it is double that of roses not treated with Paclobutrazol. After nearly two years of continuous practice, the results are quite good. Last year, one plant bloomed more than 40 flowers, and this year it bloomed 66 flowers, with a diameter of 8-10 cm, bright red flowers, flesh petals with golden yellow villi, shining in the sun, and extremely fragrant.
Roses treated with Paclobutrazol can bloom 15-20 days earlier than untreated ones, and sometimes they can bloom another batch in autumn. This method can also be used for potted flowers such as roses, roses, and climbing roses. However, it should be noted that the effects of Paclobutrazol on roses, roses, and roses are different. Moreover, the efficacy of the drug can generally be maintained for about 3-6 months. When new buds start to grow vigorously again, the second dwarfing treatment should be carried out in a timely manner. In addition, two weeks after all the rose flowers have withered, immediately bury 50g of bone meal in the potting soil to replenish the nutrients consumed. Otherwise, the flowers of the following year will be small and few, showing a phenomenon of large and small years. (China Flower Potting and Bonsai, October 1996)
Additional content revised by flower friend xm275:
I have another copy of the experimental analysis report "The effect of Paclobutrazol on the growth and quality of greenhouse potted roses" - "Northern Horticulture" 2011 issue 13.
Apply different concentrations of Paclobutrazol by spraying or watering (only one method is chosen for each pot), with the rose variety being "Fechan". The spraying should be suitable for leaf droplets, and 100ml per pot for watering, every 7 days, for a total of 6 treatments. Spray a foliar fertilizer (KH2PO4 and urea) every 3 days, with a concentration of 0.15%.
The experimental results show that the best treatment method is to spray Paclobutrazol (1000mg/L) during the leaf expansion period, which not only prolongs the ornamental period of potted flowers, increases the flower diameter, increases the fresh weight of leaves, reduces the plant height by shortening the internode spacing, makes the plant shape full without flower head bending, and improves the ornamental value, but also extends the ornamental period. The second is root watering (200mg/L), which can also effectively reduce plant height and improve ornamental effects, but due to multiple root waterings, it is easy to form internal matrix residue, affecting the later growth of the plant.
Also, the shorter the plant height of potted plants is not necessarily better. According to the golden section law, when the height of the flowerpot is 24CM, the height of the plant should be about 38CM.
So, for the safety of your flowers, please use spraying as the main method.
The above is the complete content of the promoting effect of Paclobutrazol on the flowering of potted roses, for your comprehensive understanding and reference!