ACHILLEA DISEASE PROBLEMS
Stem rot causes decay of the stem bases. In wet weather, Bacterial crown gall causes formation of round, rough a cobwebby growth develops on the lower stem. The lower leaves rot and the upper portions of the plant wilt and die. No chemical ... [... more]
Michigan State University Extension |
Lobelia cardinalis--Cardinal Flower
Hardiness Zones: 2 to 9 Height: 3 ft Spread: 18 in Type: herbaceous perennial Flowers: Red Comments: Cardinal Flower produces spikes of bright red flowers late in the summer. Grow the plant near water as it prefers moist soils. Lobelia grows best ... [... more]
Michigan State University Extension |
AQUILEGIA DISEASE PROBLEMS
Leaf spots may be seen on columbine. Destroy infected Crown rot causes the crown and stem to rot. The plant Root rots cause root system decay. Avoid soils known Cucumber mosaic virus causes leaf mottling and stunted leaves at the end of the ... [... more]
Michigan State University Extension |
Caltha palustris--Marsh Marigold
Height: 24 in Spacing: 24 in Comments: Marsh Marigold produces 2-inch yellow flowers in spring. The plants tolerate sun or some shade but in the sun they must have a moist soil. They prefer a wet, acid soil and can be grown near water. The leaves ... [... more]
Michigan State University Extension |
MONARDA DISEASE PROBLEMS
The only serious disease problem is powdery mildew which must be controlled to prevent defoliation. The disease may completely cover the plant with a white powdery growth (Vis. 1) then the leaves yellow and drop. [... more]
Michigan State University Extension |
Hibiscus moscheutos--Rose Mallow
Height: 6 ft Spread: 4 ft Flowers: Red, pink, white Comments: Rose Mallows are large, fast-growing plants that States. Some can grow 8 feet tall and produce flowers 10- October and prefer full sun or partial shade and any garden Propagation: The ... [... more]
Michigan State University Extension |
Mertensia virginica--Virginia Bluebells
Height: 24 in Spread: 12 in Comments: Mertensia (Vis. 1) is a tolerant plant producing The plant is useful for naturalizing (Vis. 3). The flower The plants grow in shaded spots and tolerate most soils. A Propagation: Propagation is by seed or ... [... more]
Michigan State University Extension |
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