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WARNING – WARNING
SILVER MAPLE Acer saccharinum: has a very invasive root system which will grow into and block water or sewer pipes, foundations, and sidewalks. AboutGardenPlants.com states, “There are many considerations to think about before planting silver maple trees. First of all is the soft nature of the wood. In areas with extreme weather storms, this tree will likely become damaged easily. A second consideration is that the roots are intrusive. Roots of silver maple trees have been known to break sidewalks and through basement walls.” FAIR MAIDENHAIR-TREE Ginkgo Biloba: produces a bad smelling fruit that drops in the fall creating a big smelly mess to clean up! About.com: Forestry calls it a, “Stink-bomb Tree; The ginkgo is dioecious. That simply means that there are separate male and female plants. Only the female plant, when fertilized, produces the oval, slimy, tan-orange ginkgo fruit . The fruit stinks! The smell's description ranges from "rancid butter" to "vomit". This foul smell has limited ginkgo's popularity while also causing city governments to actually remove the tree and ban the female from being planted. Male ginkgoes do not produce a fruit and are selected as the main cultivars used to transplant in urban communities. The slippery pulp can also be a liability. Because of potential city sidewalks slimed with the pulp of the fruit, urban landscapers recommend only the male tree. Some of the best varieties found to plant are 'Autumn Gold', 'Princeton Sentry' and 'Fairmont'.
EXOTIC BUCKTHORNE Rhamnus frangula: was introduced to Illinois in the early 1970’s and was later found to be a very invasive and weedy tree. According to Plant Conservation Alliance’s Alien Plant Working Group, “Exotic buckthorns tend to form dense, even-aged thickets, crowding and shading out native shrubs and herbs, often completely obliterating them. Dense buckthorn seedlings prevent native tree and shrub regeneration.”
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