Description

Hardy Hibiscus are US native plants that feature very large single petal flowers sometimes as large as a dinner plate. Colors include white, pink, red, magenta, purple with many different combinations. Foliage can range from green to reddish to dark purplish black. Hardy hibiscus breeding to produce improved cultivars has come a long way in the last 10 or 20 years. Hibiscus emerge later than most other perennials, needing the ground to heat up before growing in May. Hibiscus tolerate a wide range of soil conditions including clay and wetness but prefer rich garden soil. Drought is tolerated with established plants although flowering will be reduced. Generally, the 40 inches of rainfall in Eastern Kansas is sufficient. Full sun is best for optimal foliage coloring, growth habit, and flowers. When used in a landscape, hibiscus brings a tropical feel when flowering and are noticeable from very far away. Combine with hardy bananas (musa basjoo) and other contrasting flowers. Groupings of hibiscus are very effective around water gardens, rain gardens, backyard fences, pollinator gardens, and roadside areas where you only have a second to look when driving by. Modern hibiscus cultivars do not set seed and do not need to be deadheaded like old varieties; the result is continuous blooming from July till September. Cool autumn nights below 50 degrees F initiate beautiful fall foliage colors ranging from red and purple to fiery orange. Maintenance is pretty easy: just cut down dead stocks to the ground at some point in fall or winter. A yearly time-release fertilizer is appreciated from most heavily flowering plants. There are some occasional foliage pests for hibiscuses including leaf miners, grasshoppers, and Japanese beetles but these can be treated. If not treated, it generally won't kill the plant, especially if the plant is otherwise healthy and in good growing conditions. Hibiscus 'Mars Madness' is a Walters Gardens Inc. introduction. Dark olive green leaves have copper highlights, with the newest leaves emerging coppery purple. The large, maple-like leaves are broadly smooth and form a full, billowy habit. Huge 6-8" flowers open flat and are magenta red in color, more on the pink side of the spectrum than 'Cranberry Crush'. Each flower has a small, darker red halo with overlapping petals and deeply impressed veins. Flowers are produced from the top to the bottom of the plant, rather than only at the top like some older cultivars.