Weed Control Guy.com

Russian Thistle – Also known as Tumble weed.

This is an annual herb, not a weed, but most states have this categirized as a weed.  It will grow to be .5-6 feet tall.  These weeds can be found almost year round in the southwest.  It can grow in elevations between 150 – 7,000 feet and ususally flowers May to Oct or Nov.  This weed seeds out to spread.  As the plants dry out they break off at the base and start to blow around spreading it seeds.  They are known as ‘tumble weeds’ after they break off.  Glyphosate is the best product to control this.  To prevent this weed or herb use a premergence.