Show #104 - Fall Lawn Care in the DC Area | September Seeding, Fertilizing & Shade Solutions

Fall Lawn Care Guide: Why September Is the Best Month for Seeding in the DC Area

Fall has officially arrived, and with it comes the best gardening season of the year for the Washington, DC region. With cool, dry weather lasting for several weeks, September through November is the perfect time to give your lawn and landscape a healthy boost.

Whether you’re seeding a new lawn, repairing bare patches, or tackling weeds, this season provides endless advantages.

Why September Is the Perfect Month for Lawn Seeding

Tall fescue seed requires overnight lows above 45°F for proper germination.
Grass grows tops in warm weather and roots all winter long, giving you stronger turf.
With good timing, your lawn has months of root growth before summer heat returns.

Step One: Kill Weeds Before Seeding

Mix 4 oz Image All-in-One + 1 oz Wilt-Pruf per gallon of water.
Benefits:
- You can seed immediately.
- Kills almost all lawn weeds.
- Wilt-Pruf allows you to seed immediately.
- Dying weeds act as natural straw mulch to protect seedlings.

Improve Soil for Stronger Grass

Apply McGill’s Soil Builder or Coast of Maine Black Earth for microbial activity.
Spread a ⅓”–½” layer across the lawn or just damaged areas.
Cover with Greenview Grass Seed Accelerator → reduces watering needs by 50%.
Add Kick Start (humate) to your water to speed germination up to 50%.

Fertilizer Tips for Seeding Success

Fertilize at seeding time for best results.
Best choice: Turf Trust Fertilizer
- Low salt content (safe for seedlings).
- High slow-release nitrogen.
- Potash in the form of sulfate of potash (not harsh muriate).
- Includes trace elements like iron.

Skip outdated formulas like 10-10-10 or old “Seed & Sod Starter” products.

Weed Spotlight: Creeping Spurge

Creeping spurge spreads rapidly in late summer and fall.
Best control: Fertilome Weed Free Zone or Image All-in-One.
Not sure about weed ID? Bring a sample to your Independent Garden Center for help.

Core Aeration Replaces Dethatching

Modern tall fescue produces very little thatch, unlike old bluegrass lawns.
Core aeration is the best method:
- Do 3 passes (north-south, east-west, diagonal).
- Fill holes with black soil + Greenview Grass Seed Accelerator.
- Water only after 5 PM to reduce evaporation.

Why Grass Fails in Shade (and How to Fix It)

Poor Soil in Shade

Shaded soil has low microbial activity.
Solution: topdress with McGill’s or Coast of Maine Black Earth.

Wrong Grass Seed

Tall fescue = sun grass.
For shade, plant: chewings fescue, creeping red fescue, hard fescue, perennial ryegrass, and a little bluegrass.

Not Enough Sunlight

Sun only counts between 11am and 5pm.
1 hour dense shade.
2 hour medium shade.
3 hours light shade (tall fescue can be used).
4 hours full sun.

Alternatives:

Limb up trees or remove weak ones.
Plant shade-loving groundcovers like pachysandra, periwinkle, or dwarf mondo grass.

Best Fall Lawn Products (Available at Betty’s)

Turf Trust Fertilizer – best for seeding.
Image All-in-One + Wilt-Pruf – weed control + safe seeding.
McGill’s Soil Builder / Coast of Maine Black Earth – soil improvement.
Greenview Grass Seed Accelerator – retains water for better germination.
Kick Start (humate) – speeds up seed growth.

Plus, Betty’s offers a free 8-page Lawn Calendar and 14-page Weed Treatment Guide.

This Week’s Lawn & Garden Checklist

Apply Dylox grub killer and water in.
Kill weeds, core aerate, lime, and seed.
Re-fertilize strong vegetables (esp. tomatoes).
Use Kick Start on annuals for late-season growth.
Plant mums now; pansies by mid-September.
Increase watering as late-summer turns dry.

With September’s ideal conditions, you can seed, fertilize, and repair your lawn for long-lasting success. With the right products and timing, fall lawn care becomes simple, effective, and rewarding.