Hardy hibiscus is an unusual plant because its flowers can grow to be up to 12 inches wide. The large flowers and stems attract butterflies, bees, birds and so on. Thanks to modern breeding techniques, the range of hibiscus colors is now enormous, from hot pink to plum. This unique combination of traits makes hardy hibiscus a welcome addition to just about any garden.
When determining where to plant your hibiscus, be sure to understand how large your particular plant will grow. The range of hibiscus sizes, like its flower colors, is vast. The area should be one that receives a minimum of six hours of sunlight per day. Hibiscus can grow in just about any soil type, but they prefer ground that is slightly acidic. You can garner this pH level by mixing peat moss into the soil. Also note that your hibiscus should be planted no later than two months before the first frost.
Until they are mature, hibiscus plants need a lot of water. They actually do well in swampy conditions, so try to keep your hibiscus moist at all times. Because it is a perennial, hardy hibiscus needs to be fertilized each spring. A timed-release organic fertilizer is perfect. This will also aid the hibiscus in its attempts to self-sow, although the plant does this relatively easily under most conditions.
During winter, your hardy hibiscus can be trimmed after the first frost. Cut the plant back to about a foot from the ground, and add a layer of mulch at least 12-inches deep. Remember to shovel any snow that may fall on top of this mulch, as you actually want to keep the plant cold, not warm. You might want to mark the area at which your hibiscus plants are located, as they are late-bloomers. You will not see them re-sprout until their soil is about 70 degrees.