Let me introduce annual bluegrass. This gem is a winter annual, which is a fancy way of saying it germinates in September, generates growth during the winter and starts to decline with the onset of summer heat in June. This little guy comes on strong in the fall and looks very similar to the beautiful tall fescue seedlings you just planted. It matures through the winter, just like your fescue, and peaks out in April when spring temperatures are starting to rise. The downside of annual bluegrass is the obtrusive seed heads it produces in the spring. This "annual" has to regenerate itself to sustain life by producing seeds that will stay dormant over the summer and germinate again in the fall.
What does this mean for the homeowner? If not addressed:
- We will see the white seed heads in spring
- It will choke out your new fescue seedlings
- It will leave voids over the summer where it checks out due to hot temperatures.
The bad part: if you overvseed in the fall, there are no pre-emergent strategies because you don't want to prohibit seed germination.
The alternative: treat with a post-emergent around Thanksgiving and Christmas for a clean lawn in the spring. Just think of it as an early Christmas present to yourself and your lawn!
Keep it green!