From the agricultural press, we've learned that applying sugar solution to vegetables can significantly improve yield and quality. Inspired by this, since 1997, I have experimented with using it in flower cultivation and have gained considerable benefits. Now, I'd like to share my experience with fellow flower lovers. Give it a try.
In my experience, brown sugar performs better than regular sugar, and powdered brown sugar is even more effective than crystallized brown sugar. However, it's crucial to use it appropriately depending on the situation. "Moderate" refers to both concentration and frequency of application.
For seed soaking, herbaceous flower seeds and cactus seeds can be soaked in a 0.5% to 1% brown sugar solution for 6 to 8 hours. After planting, the seedlings grow stronger, show improved disease resistance, and have a higher germination rate with more uniform growth.
When spraying seedlings, a 0.2% brown sugar solution works well on herbaceous and woody plants on sunny days. The seedlings become thicker, and their leaves grow faster. For example, Clivia, Camellia, and Bougainvillea benefit from foliar sprays. When using a mist sprayer, finer droplets are better. For Clivia, apply a small amount, making sure the leaf surface is moist but not dripping. Avoid over-spraying, as this could harm the plant.
For foliage plants, spraying a 0.2% to 0.5% brown sugar solution helps thicken the leaves, increases chlorophyll content, and enhances the plant’s natural antibacterial properties. Colored leaves become more vibrant, especially when using 0.2%. However, for Tieshu (a type of plant), 0.4% to 0.5% is more effective. Overall, lower concentrations are preferable, especially when starting out. Don't overdo the foliar sprays—some plants, like eucalyptus or certain ornamental trees, may not respond well. In fact, some species might look worse after application.
For flowering and fruiting plants, after the blooming and fruiting period, spraying a 0.5% to 1% brown sugar solution (ideally 0.75%) helps produce larger, more colorful fruits. If possible, adding 0.3% potassium dihydrogen phosphate can further enhance results.
For disease prevention, a 1% brown sugar solution sprayed every 3–5 days has proven effective against downy mildew, powdery mildew, black spot, and leaf blight. Applying it three times in a row usually shows good results.
When preparing the solution, it's best to use boiled water and let it cool before use. I don’t have a wide variety of flowers, nor have I been doing this for very long, and my knowledge of the chemical structure and mechanisms of sugar is limited. All I can offer is my practical experience based on what I’ve observed. I hope this information proves helpful to you. Try it and see how your plants respond!
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