The ideal temperature range for hydroponic flowers to survive the winter is similar to that required for traditional soil-grown plants. Most hydroponic flowers are not cold-tolerant, and their optimal growth temperature typically falls between 18°C and 25°C. If the temperature drops below 10°C, many plants will experience stunted growth, and their leaves may lose their vibrant color. When temperatures fall below 5°C, most foliage plants can suffer from various issues such as leaf burn, yellowing of older leaves, wilting, or even death.
If you don’t have access to heating systems or climate control, it’s best to choose hardier varieties that can tolerate a broader range of temperatures, such as Monstera, Calla Lily, Ivy, Tiger-limited Evergreen, and Clivia. Additionally, you can use old foam boards to create insulation around your hydroponic containers. Cut the boards to fit the size of your vessels, then glue or tape them together to wrap the containers. When indoor temperatures drop below 10°C, cover the plants with newspapers, plastic sheets, or warm the water to around 18°C to 25°C to help maintain stable conditions.
During winter, when room temperatures fall below 10°C, most hydroponic flowers enter a dormant or semi-dormant state. At this time, it's advisable to stop using nutrient solutions and instead use only tap water. Make sure to change the water regularly—ideally every 10 to 15 days—and keep the water temperature between 18°C and 25°C. Clean the plant roots and ensure the containers remain free from debris. If the water is clean and fresh, you can extend the interval between water changes to 15–20 days, or even up to 30 days without harming the plants.
For hydroponic flowers that continue to grow slowly during winter, such as Kaffir lily or Calla Lily, you can apply a diluted nutrient solution once every 10–15 days to support their health and growth. Always monitor the plants closely and adjust care based on their specific needs. With proper attention, your hydroponic garden can thrive even in colder months.
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