On Feb 19, 2008, Malus2006 from Coon Rapids, MN (Zone 4a) wrote:
Giant ragweed are more oftenly seen in gardens than common ragweed but in other locations such as roadside common ragweed is far the most often. It is easily identify by its strongly three lobed leaves that look kind like sassafras but is not woody. It is also common only in certain area like when construction workers clear out all the vegetation on the roadside for a certain period of years before grasses and other agressive species reduce the numbers - it will persists in certain locations. Giant ragweed is easy to control - it is the rain of seeds that comes in from nearby locations that is the main headache for this weed.
On Dec 16, 2004, Pyrola5 from Bradford, PA (Zone 5a) wrote:
Giant ragweed came up in my flower bed one year,I didn't know what it was so I let it grow. It was GIANT, well over my head. I sent pictures to the county agent. He told me what it was and I dug it out and got rid of it. It never returned. I live in NW PA, so it definitely grows here. My daughter is allergic to ragweed.
On Dec 15, 2004, BotanyDave from Norman, OK (Zone 7a) wrote:
A beautiful weed with an interesting and easily controlled growth pattern. The leaves may be unlobed, or multiple-lobed (although the most common are 3, 5, or 7). Plants are very difficult to transplant, but it can be done if water is used constantly. Seeds need to be outside during winter in order to germinate in the spring- treating in the house is possible but difficult (or they could be treated with various chemicals). Plants in partial shade and damp soil do very well. Mature plants are easily removed with a saw.
On Jan 31, 2003, Muckdiver from Saint Louis, MO wrote:
I found a way to eliminate the ragweed by cutting the stem near the base, just before it started to bloom in the fall.
A weed-whacker is a good way to do this. Note that seeds remain in the ground and will germinate if the soil is tilled; the seedlings can be pulled if this happens.