Perennial Hibiscus Plants
Growing hibiscus in zone 6 is very easy, as long as you choose a hardy variety. Hardy hibiscus plants are usually hardy down to zone 4. Their sizes vary depending on their species, but as a rule, they’re bigger than their tropical cousins, sometimes reaching heights of 15 feet (4.5 m.) and widths of 8 feet (2.5 m.). Their flowers, too, are much larger than those of tropical varieties. The largest can reach a foot (30.5 cm.) in diameter. They tend to come in shades of white, pink, and red, though they can be found in other colors. Zone 6 hibiscus plants like full sun and moist, rich soil. The plants are deciduous and should be pruned back in the fall. After the first frost, cut the plant back to a foot high and pile a thick layer of mulch over it. Once there’s snow on the ground, heap it on top of the mulch. If your plant isn’t showing signs of life in the spring, don’t give up hope. Hardy hibiscus is slow to come back in the spring and may not sprout new growth until the soil reaches 70 F. (21 C.).
Hibiscus Varieties for Zone 6
Perennial hibiscus plants that thrive in zone 6 include a wide variety of species and cultivars. Here are a few especially popular ones: Lord Baltimore – One of the earliest hardy hibiscus hybrids, this cross between several native North American hardy hibiscus plants produces striking, solid red flowers. Lady Baltimore – Bred at the same time as Lord Baltimore, this hibiscus has purple to pink flowers with a bright red center. Kopper King – Developed by the famous Fleming brothers, this plant has enormous pink flowers and copper-colored leaves.
