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The palmately compound leaves of cutleaf blackberry have 3 to 5 deeply lacerated leaflets. Evergreen leaves, large thorns on stems; leaves in groups of 5; small white to pink flowers.
|Soil and Moisture Conditions|
|Distribution||Non-native blackberries have become a significant problem on the west side of the Cascades where they are much more aggressive than on the east side. They can be found in a myriad of habitats such as roadsides, vacant lands, pastures, Forest plantations, creek gullies, river flats, riparian areas, fence lines, and right-of-way corridors.|
|Control||When plants are young, hand pull the stem close to the ground and uproot the root ball. This method is most effective in loose soils or after a rain. For small infestations, dig up root crowns and grub roots. Be sure to monitor the work area for large root fragments which, when left in the ground, can re-sprout. Mowing, including the use of riding mowers and tractor-mounted mowers, can be very effective to control blackberries but may also harm desirable plants. Cut vines several times a year over several years to exhaust the energy reserves. Do not mow where soils are highly susceptible to compaction or erosion, or where soils are very wet. Note: Birds may nest in blackberry patches from early spring through July. Mow large berry thickets during dry periods in the fall or winter to prevent damage to nesting birds. Once the large canes have been cut, follow up by mowing the younger plants in the summer. Plant trees to control blackberry over the long run. Established trees will shade out blackberry and improve habitat for other native species and wildlife.|
|Reproduction and Spread||Invasive blackberry reproduces vegetatively by root and by seeds which are dispersed by birds and other animals eating the fruit.The plants begin flowering in spring with fruit ripening in midsummer to early August. Daughter plants can form where canes touch the ground and begin rooting.Seeds can remain viable in the soil for several years.|
|Look Alikes||native blackberry|
|Impact||They out-compete native understory vegetation and prevent the establishment of desirable native shade-intolerant trees such as Douglas-fir. Blackberry can limit the movement of large animals by forming large, impenetrable thickets.|