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Johnsongrass is one of the most abundant and vicious throughout the United States. It thrives in open, disturbed, rich, bottom ground, mainly in cultivated fields. In Arizona, it is found along irrigation ditches, streams, and in any kind of moist waste area. Unless it is constantly controlled, johnsongrass has the ability to completely take over agricultural lands. This weed can grow as tall as 8 feet including the stem which may reach 2 ½ feet deep in the dirt. It can produce more than 80,000 seeds in a single season. The seeds easily fall to the ground and fall underneath the weed that produced them. It begins flowering at the beginning of April and continues through November.
Large crabgrass, a native of Europe, is commonly found in southern and central Arizona. It is a weed of moist soil and is mainly a problem in cultivated fields, streams, roadsides, and lawns during the summertime. Large crabgrass is the most widespread annual grassy weed in yards and landscaped areas. The plant itself grows anywhere from 8-28 inches tall and contains many branches at the base. This weed commonly begins flowering in February and may last through summer as the weed matures late May through October.
Stinkgrass is a very common weed found in the state of Arizona from early summer through late fall in cultivated crops, gardens, roadsides, and heavily soiled lands. It is, however, uncommon in the northeastern part of Arizona. Stinkgrass has been found to be poisonous among horses that eat large quantities of dry or fresh stinkgrass over time; although no reports have been made in Arizona. This European weed begins flowering from early May and may last through October and the may be found mixed with small grains and seeds causing an impurity among crop seeding.
Yellow nutsedge is one of the most common weeds found in Arizona, flowering anywhere between May and November or when our fall frosts begin to arrive.
The nutsedges are the most commonly found in or near cultivated fields, covering large areas in cotton fields, alfalfa pastures, dams, and ditches. It is also very common to spot these weeds along streams and roadsides.
The purple nutsedge is very similar to the yellow nutsedge with a few differences other than the obvious physical appearances. The purple nutsedge is mainly confined to the valleys of southern Arizona flowering at the same time as the yellow nutsedge (May –fall frost). When found in summer crops, lawns, ditch banks, and field borders; the stem, runners, and tubers make the weed almost impossible to get rid of.