… trees from insect attack? A. Spraying trees or shrubs with a horticultural, or dormant, oil is recommended as a way to help control repeated attacks of scale, mites, and aphids. Some of the … scale and obscure scale, honeylocust mite, European red mite, and spruce spider mite. The oil is applied when the tree or shrub is dormant, before it buds out (usually in March), when the temperature is at least 40 degrees …
Type: Plant Info
… Q: I have a lot of Creeping Charlie weeds in my lawn. When is the best time to apply a weed killer? A: Mid- to late autumn is an excellent time to apply post-emergent herbicides to control invasive weeds in turf such as … after application to allow more leaf surface to absorb chemicals. Apply only when no rain is expected for approximately 24 hours. Also, it is important to apply weed killer when the air …
Type: Plant Info
… Hybridized by Kail-Rudolf Beckmann in 1991, the Maren poinsettia is an early- to mid-season cultivar with medium vigor. Its traditionally shaped bracts are a … pink, which will turn pink when grown in warm greenhouses. The broad, elliptical foliage is medium green. At a height of 12 to18 inches and a spread of 12 to14 inches, it is a good midseason selection to perk up holiday displays. It attracts butterflies and is deer …
Type: Garden Guide Plant
… The bracted balsam fir, also called "Canaan fir" is an evergreen fir native to the northeastern United States and Canada. Growing upwards of 50 … dark-green to blue-green needles, it has a narrow pyramidal form with upswept branches. It is primarily grown as a Christmas tree by the nursery trade but may be used as a specimen conifer in the garden. This fir is differentiated from the species by the conspicuous papery bracts protruding from the cones. It …
Type: Garden Guide Plant
… large multi-stemmed shrub, reaching 15-20 feet tall at maturity. A native of northern Asia, it is hardy to zone 2. The glossy green leaves are smaller than most maples, divided into three … late summer, an abundance of winged seeds called "samaras" may litter the lawn and sprout. It is easy to grow in moist, rich, well-drained soils in full sun to part shade and performs well in … with orange in the fall. Unfortunately, the cooler climate of northeastern North America is so suitable to this species that is has become invasive in some areas, including Illinois. …
Type: Garden Guide Plant
… STATE STREET® maple cultivar is a densely branched shade tree that can reach a height of 50 feet and width of 35 feet with … habit and symmetrical branching; it has deeply furrowed, corky bark. Though miyabie maple is listed as endangered in its native habitat in Japan, several cultivars are considered hardy, adaptable urban street trees. The dark green leaves turn golden in fall. This tree is a Chicagoland Grows® selection. Chicagoland Grows® is a plant introduction partnership of the …
Type: Garden Guide Plant
… Avalanche Variegated Feather Reed Grass is a clumping ornamental grass that has leaf clumps growing to about 4 feet high and 3 feet wide, … climates. The flower spikes are usually retained for winter interest and the entire plant is cut back or in late winter to promote new growth. This plant is sterile, so self-seeding is not a problem, and the plant does not spread aggressively making …
Type: Garden Guide Plant
… May and June, have numerous overlapping strap-like petals and a fruity scent. ROY’S DARK RED is a hardier selection made by Roy Klehm of Song Sparrow Farm in Wisconsin. Flowers are a rich … states, it blooms on new growth, so do not prune until after flowering. The Chicago area is a little north of its native range, so some winter damage may occur, but will not affect flowering on new growth. The genus Calycanthus is separated into its own family, with its nearest relatives in the laurel family, which includes …
Type: Garden Guide Plant
… of tubular yellow flowers with long stamens and pistils protruding from the flowers. The fruit is a dry capsule with long filaments. Plants can spread by suckers and may form colonies. Diervilla lonicera is the most wide-spread of the three species, found is eastern Canada, eastern and central U.S., including Illinois. The yellow flowers turn …
Type: Garden Guide Plant
… tubular yellow flowers with long stamens and pistils protruding from the flowers. ‘Butterfly' is very floriferous. Because the sets of leaves are spaced so closely towards the ends of the … of flowers can number up to 50 florets, with an extended bloom period. Overall, the foliage is dark green, but new leaves are brushed with bronze and have a fine picotee of red. Fall color is reddish-purple. Bush honeysuckles, native to dry woods and clearings, are adaptable to many …
Type: Garden Guide Plant
