Black-Grass: What you need to know
Black-grass thrives on heavy land, particularly where drainage is poor. On light land it is a problem on wetter areas. About 80% of seeds germinates in the autumn. Hot, dry summers see strong early autumn-germination; cool wet autumns see increased dormancy and delayed germination. Increasingly a major problem throughout England and worsening through herbicide resistance.
Tall erect annual. Compact flower spike 3 - 13 cm; narrow and pointed, often tinted purple. Seedling leaf sheath often purple.
Leaf blade: Bluish-green, short, flat and hairless. Usually rough with well-defined keel and usually rolled.
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