I have an annual grass or grass like weed
- Use a pre-emergent herbicide in the early spring; late
April to early May. Another applications can be made 6-8
weeks later to help prevent winter annuals.
- For crabgrass, apply when the forsythia comes into bloom.
Note: Use of a pre-emergent in the spring means you’ll
have to seed any new grass in previous fall.
- Use a post emergent herbicide when the weed first emerges.
Young weeds are the most susceptible.
- For summer annuals this will be in the spring. For winter
apply in the late spring, summer or fall. Depending on
species present.
- Never allow annual weeds to go into bloom.
- Post emergents for grassy weeds include the arsenates:
MSMA, DSMA, and AMA. These herbicides can also be found
pre-mixed with post emergent broad leaf herbicides. Acclaim
is an effective herbicide for post germination crabgrass
control.
I have a perennial grass or grass like
weed
- Determine if it is a sedge or a grass
- If it is nutsedge: apply herbicide when 3-8 leaves are
present.
- If it is a grass (quakgrass, orchardgrass) apply a broad
spectrum like glyphosate specifically on the undesirable
plant. Careful not to get glyphosate on desirable grasses.
I have an annual broad leaf weed
- Determine if it’s a summer annual or a winter annual.
- If it’s a summer annual, use a broad leaf herbicide
early in the spring as soon as the weed emerges.
- If it’s a winter annual, use a broad leaf herbicide
in the late summer, early fall as soon as the weed emerges.
- Find out how the weed propagates.
- If it propagates by seed, never allow the weed to bloom.
- If it propagates by rhizome, be sure to use an herbicide
that moves within the plant so it translocates down to
the rhizome.
I have a perennial broad leaf weed
- Treat with an herbicide in the fall.
- At this time, the plants are putting most of their energy
to the roots to store for the winter. They will move the
herbicide there too, for a total kill.
- Be careful when using herbicide to treat for perennial
broad leaf weeds, as they may injure desirable plants too.
Read the label.
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