![]() Evergreen Azalea and Rhododendron are susceptible to desiccation due to winter winds and lack of moisture.Īpplying an anti-transpirant in December and February can help prevent the foliage from drying out, turning brown, and dropping off. Watering thoroughly until the ground freezes allows the plant to properly acclimate to winter. Rhododendrons continue to grow well into autumn and are susceptible to early freeze damage. It prefers cool, moist organic soil and is not tolerant of dry periods, so it is important to ensure it gets enough water. ‘Yaku Princess’ is hard to find and not quite as hardy as ‘Golden Lights’, but it may survive in zone 4 with protection.Īzalea is a shallow-rooted plant that should not be planted too deep. This flowering shrub has spectacular blooming qualities and a wide variety.Īzalea is generally hardy for zones 5-9, but for zone 4, ‘Golden Lights’ is bred to withstand -30 F and is mildew-resistant with golden blooms in late spring. Astilbe (Astilbe spp)Īzalea is a shade-loving flowering shrub that is frequently used to start the spring perennial show in garden beds. It attracts butterflies and is deer-resistant, and it is recommended to allow enough space for good air circulation to reduce the incidence of mildew. It is hardy in zones 4-8 and has proven hardy in zone 3. This low-growing perennial has a neat growing habit and is perfect for the front of the border, containers, and cut arrangements. x novi-belgii ‘Alert’ has double vivid red-purple blooms with bright yellow centers and is long-living and disease-resistant, although it can be bothered by powdery mildew. Rich soil produces taller plants, and it is recommended to divide them every three years in spring.Īsters are excellent cut flowers, and the Perennial Index lists several varieties. These plants prefer moist, reasonably fertile soil and do not tolerate drought, so it is important to keep them watered during dry periods. They bloom in late summer and fall when other perennials and annuals are fading, adding a nice touch to any garden. Hardy asters are easy to grow and care for, making them a popular choice for many gardens. Most varieties grow to about 4 feet tall, but they can range from 2 to 5 feet in height. If snow cover is dependable, they should not need winter protection up to zone 4, but at least 3 inches of mulch is recommended. Most Liliums are hardy to zone 4, with some varieties even to zone 3. Lilium does not thrive in wet soils, and clay soil should be amended with organic material or peat to improve drainage. It is recommended to give them at least 6 to 8 hours of sunlight for strong plants. Lilium is hardy and robust, but too much shade can result in spindly stems that struggle to support the masses of blooms. Corms multiply rapidly and can be easily divided and thinned as needed every 3 to 5 years. Orientals, however, are fragrant and sometimes have more "tropical" looking blooms.īoth varieties bloom generally in June and July and make great cut flowers. They are easier to grow than Orientals and can tolerate a wider range of soils. They generally have larger blooms and are larger overall, often blooming later than Asiatic lilies.Īsiatic lilies, on the other hand, are available in a wider range of colors and multiply more rapidly. Oriental lilies are known for their striking masses of blooms in pinks, whites, yellows, and reds. Asiatic lily (also Oriental lily) (lilium) This is a must-have in the north-central garden for fragrance and attracting wildlife. ![]() ![]() ![]() Blue Giant prefers full sun and well-drained soil, but can also thrive in part shade with moist conditions. It grows up to 4 feet tall, producing dense spikes of bright blue tubular flowers in July and August. Commonly called anise hyssop or Blue Giant Hyssop, its leaves are often used for seasoning and tea, emitting an aroma similar to mint, anise, or licorice. As it is found natively in northern Wisconsin, it should be hardy to zone 4. The Perennial Index lists several varieties of Agastache.Īgastache foeniculum, also known as anethiodorum, is an excellent choice for the north-central growing zones. Since most Agastache self-seed readily, it is recommended to deadhead to prevent reseeding. Agastache comes through winter best if left uncut. They have an upright growth habit with tall flower spikes, and removing spent spikes will encourage more blooming.Īlthough most Agastache thrive in the drier zone 5 and warmer growing areas, some species can even flourish in the cold, wet winters of the northeast. ![]() Generally, they prefer full sun, bloom from midsummer to autumn, are drought tolerant, and make excellent container plants. Agastache, also known as Hyssop and hummingbird mint, is a perennial genus that includes a wide variety of species, all of which attract butterflies and hummingbirds. ![]()
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