Chicago Botanic Garden lawn care, month by month
| Month | Tasks |
|---|---|
| January | Dormant — keep leaves cleared, stay off frozen turf |
| February | Dormant — keep leaves cleared, stay off frozen turf |
| March | Dormant — keep leaves cleared, stay off frozen turf |
| April | Apply crabgrass pre-emergent · Light feeding after green-up |
| May | Light feeding after green-up |
| June | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| July | Mow high (3–3.5″); water deeply in dry spells; no feeding in heat |
| August | Aerate + overseed · Main fall feeding |
| September | Aerate + overseed · Main fall feeding · Winterizer feeding |
| October | Winterizer feeding · Final mow of the year |
| November | Final mow of the year |
| December | Dormant — keep leaves cleared, stay off frozen turf |
Reading the Chicago Botanic Garden lawn year
Chicago Botanic Garden runs on the classic northern rhythm: a short, important spring (pre-emergent before soil hits 55°F, one light feeding), a defensive summer (mow tall, water deep, feed nothing), and then the season that actually builds a lawn — early fall, when aeration, overseeding around Aug 22 – Sep 6, and the year's main feeding all land before the Oct 21 frost closes the year.
Grasses that fit Chicago Botanic Garden
Frequently asked questions
When should I overseed my lawn in Chicago Botanic Garden?
For cool-season grass (bluegrass, fescue, ryegrass), overseed in early fall — in Chicago Botanic Garden that means roughly Aug 22 – Sep 6, timed 45–60 days before the average first fall frost (Oct 21) so seedlings establish before cold. Spring works as a backup but collides with crabgrass season.
When do I put down crabgrass preventer in Chicago Botanic Garden?
Aim for Apr 5 – Apr 26 — the estimated stretch when Chicago Botanic Garden soil approaches the ~55°F germination threshold, anchored to the average last frost (Apr 26). It's an estimate: a soil thermometer reading 50–55°F at 2″ depth for several days is the precise trigger, and pre-emergent must go down before crabgrass sprouts, not after.
When should I stop mowing in Chicago Botanic Garden?
Keep mowing as long as the grass grows — in Chicago Botanic Garden that's typically until Oct 14 – Nov 4, around the average first fall frost (Oct 21). Take the final cut slightly shorter to discourage snow mold.
What grass grows best in Chicago Botanic Garden?
Illinois is cool-season country: Kentucky bluegrass, tall fescue, perennial ryegrass, fine fescue. See the grass guides linked below for identification and care.