Common Hawthorn trees in our area:

Hawthorn:

 

 

 

• Deciduous tree, 20-30 ft (6-9 m); dense, rounded headed.  Thrones to 2.5 cm. Leaves alternate, simple, 2-6.5 cm long, 3-7 lobed, deeply incised, glossy green.  Flowers white, 8-15 mm wide, with a single style (single ovary or stone, hence monogyna , i.e., with one pistil, the female element of a flower), in clusters (umbelate).  Fruit oblong, 1 cm diam., red, with a single stone (seed).

 

• Sun, resistant to many diseases of Crataegus, e.g. rust.  The many on the Oregon State Univ. campus possibly were rootstocks for scion types that died.

 

• Hardy to USDA Zone 4    Native to Europe, northern Africa, western Asia.  Common in the English countryside as a roadside hedge.  Not common in American gardens but naturalized in North America.  A very similar appearing species, but much rarer commerce, is C. ambigua, Russian Hawthorn.

 

• Can be invasive since it is a prolific seed producer and can form dense thickets which exclude all understory plants.  It can hybridize with native hawthorn species such as the black hawthorn (C. douglasii) found in the west (Randall and Marinelli, 1996).

 

 

 

 

 

Common problems with Hawthorn trees:

 

 

Insects:

 

Aphids			Twospotted Spider Mite
Aphids feed by sucking up plant juices through a food channel in their beaks. At the same time, they inject saliva into the host. Light infestations are usually not harmful to plants, but higher infestations may result in leaf curl, wilting, stunting of shoot growth, and delay in production of flowers and fruit, as well as a general decline in plant vigor. Some aphids are also important vectors of plant diseases, transmitting pathogens in the feeding process. A sticky glaze of honeydew may collect on lower leaves, outdoor furniture, cars, and other objects below aphid feeding sites. Honeydew coated objects soon become covered by one or more brown fungi known as sooty molds. Crusts of sooty mold are unsightly on man-made objects, and they can interfere with photosynthesis in leaves. MORE INFO			The twospotted spider mite prefers the hot, dry weather of the summer and fall months, but may occur anytime during the year. Spider mites feed by penetrating the plant tissue with their mouthparts and are found primarily on the underside of the leaf. All spider mites spin fine strands of webbing on the host plant — hence their name. For detection of spider mites, a 10X to 15X magnifying glass is a necessity. MORE INFO
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Diseases:

 

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