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The ONLY Plants That Can Outshine the Summer Sun
This article highlights a selection of 27 vibrant plants that thrive in full sunlight and high summer temperatures, making them ideal for gardens in warmer climates. It emphasizes that while many people and plants wilt in intense heat, certain species not only tolerate but flourish under such conditions, similar to how areas in the Southwest maintain lushness despite triple-digit temperatures. The piece aims to guide gardeners in choosing beautiful, easy-to-maintain flowers and foliage that resist wilting when exposed to hot sun, provided proper care is given.
The article begins by addressing common questions regarding full-sun plants, such as the easiest flowers to grow in full sun. It identifies Black-eyed Susans and Zinnias as particularly easy due to their adaptability to various well-draining soil types and drought resistance. For example, Black-eyed Susans are North American native wildflowers beloved by pollinators, growing best in USDA Hardiness Zones three to nine. They require watering at the soil level to prevent fungal diseases. Zinnias, described as vibrant annuals, prefer rich, well-draining soil and six to eight hours of sunlight daily, though they can be challenging to transplant after starting indoors.
Another key question tackled is whether hydrangeas can grow in full sun. While most hydrangeas prefer morning sun, the article specifies that panicle hydrangeas are an exception, capable of withstanding bright light and heat, especially in the Southern United States, provided their soil remains consistently moist. The importance of proper watering for full-sun plants is underscored, with expert Paris Lalicata from The Sill explaining that these plants use more water to create food and prevent overheating. Lalicata advises watering in the early morning and evening to minimize evaporation, noting that perennial full-sun plants need extra water to strengthen their root systems for re-blooming in subsequent years. Gardeners are also reminded to check their USDA Plant Hardiness Zone to ensure perennials can survive the winter.
For those interested in growing full-sun plants indoors, the article clarifies that only clear, unobstructed, south-facing windows typically offer sufficient light. Otherwise, the use of grow lights is recommended as an effective substitute for natural sunlight, especially during winter months. Modern grow lights are designed to mimic sunlight and stimulate plant growth, requiring measurement to ensure they provide 800 to 1000 foot-candles, similar to direct sunlight. The piece then details various heat-tolerant plants, including Agapanthus (Lily of the Nile), Mandevilla, Fan Flower, Sweet Potato Vine, Catmint, Russian Sage, Daylily, Lavender, Dichondra, Salvia, Petunia, Coneflower, Calibrachoa, Caladium, Hibiscus, Pentas, Ageratum, and Penstemon, providing brief descriptions of their characteristics, care requirements, and ideal growing conditions.
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