A Detailed Explanation of the Effects and Usage Methods of Paclobutrazol

In agricultural products, paclobutrazol belongs to the category of plant growth regulators, i.e. hormones. In product descriptions it is indeed said to have effects such as controlling growth, promoting rooting, encouraging tillering, and making plants stocky and productive.Growing orchidsEveryone wants to produce a few more new seedlings, and out of this idea, many beginners want to give it a try. However, the main effect of paclobutrazol is to dwarf plants, and if the concentration applied is too high, it will cause excessive tillering that is harmful and useless. Paclobutrazol is a 15% wettable powder and has low toxicity. Its dilution ratio is 1:7500 or 1:10000. In other words, 1 gram of paclobutrazol is dissolved in 7.5-10 kg of water. Anything below a 7500-fold solution is too concentrated. If a 10000-fold solution is sprayed several times, it will likewise produce an overly concentrated effect. If used too concentrated, it will make the plant grow too short. Paclobutrazol is generally used on ornamental flowers and trees that are prone to leggy growth, such as chrysanthemums, cockscomb, and scarlet sage, to dwarf them, and it can also promote dwarfing in some upright camellias. As fororchidsit can also be used, especially on those broad-leavedCymbidium sinenseit can be used. If paclobutrazol is used whenCymbidium sinenseproduces new leaves, it can make the long-leavedCymbidium sinenseshort and sturdy with wide leaves, resembling a dwarf variety. Most of the dwarf orchids sold by unscrupulous orchid dealers on the orchid market are treated this way. Fororchidsthat have already been dwarfed by paclobutrazol and have taken shape, if they are left in the original pot and grown for another year, the resultingorchidswill still be relatively short and small, because paclobutrazol has low toxicity and also poisons the growing medium during spraying. To make the orchids grow back to their original form, it is essential to repot them, rinse the orchid seedlings in water, replant them in fresh growing medium, and when theorchid plantsproduce new leaves, spray the foliage with a 1000-fold solution of urea plus monopotassium phosphate, while watering the seedlings with a dilute nitrogen-phosphorus-potassium compound fertilizer, so as to promote the growth of normal new seedlings. (Zhejiang - Gu Jun)