September Garden Reset: What to Do Now for a Healthier Fall Landscape

September is a transition month in the garden. Summer heat begins to ease, rainfall patterns can change, and plants that looked strong in July may now be showing signs of stress. Around Hanson and the South Shore, this is a good time to clean up problem areas, repair summer damage, and prepare the landscape for fall.

At Wyman’s Garden Center, September is less about “putting the garden to bed” and more about getting it back into shape while there is still plenty of growing season left.

1. Remove Tired Summer Annuals

By now, some annuals may be stretched, sparse, or past their peak. Rather than letting containers and beds decline, remove the plants that are no longer performing and replace them with fresh fall color.

Mums, ornamental kale, grasses, asters, and other cool-season selections can quickly refresh an entryway, patio, or garden bed.

2. Check for Stress, Disease, and Insect Damage

Late summer can reveal problems that were less obvious earlier in the season.

Look for:

• Brown or thinning lawn areas
• Leaf spots or fungal symptoms
• Insect feeding
• Wilting despite regular watering
• Dead or damaged branches
• Plants crowded by weeds or overgrowth

Heavy rainfall, humidity, and warm conditions can increase disease pressure, especially in lawns and densely planted areas.

If you are unsure what is causing the problem, bring a photo or plant sample to Wyman’s and ask the staff to help identify the issue before treating it.

3. Get Weeds Under Control

September weeds are easy to ignore, but allowing them to flower and set seed can create a much bigger problem next year.

Pull or treat weeds now while they are actively growing. Pay particular attention to garden edges, cracks, lawn areas, and places where summer growth has become overgrown.

Cleaning up weeds now also makes fall planting much easier.

4. Repair Summer Lawn Damage

Early September is one of the best times of year to work on lawns in southeastern Massachusetts.

Cool-season grasses respond well to cooler temperatures and warm soil. Thin areas can be overseeded, bare patches repaired, and compacted or stressed areas improved.

Wyman’s carries grass seed, lawn soil products, lime, fertilizers, and other materials for fall lawn repair. If crabgrass, weeds, fungus, or poor soil conditions caused problems this summer, now is the time to address them.

Consistent watering is especially important after seeding. Newly germinated grass cannot be allowed to dry out.

5. Refresh Mulch and Garden Beds

After a long summer, mulch may be thin, washed out, or compacted.

Rake existing mulch lightly to loosen it and add more only where needed. A proper mulch layer helps conserve soil moisture, moderate temperature swings, and reduce weed growth.

Avoid piling mulch directly against tree trunks or shrub stems.

September is also a good time to redefine bed edges and remove dead foliage or debris that could shelter pests or disease.

6. Water Deeply, Even as Temperatures Cool

One common September mistake is cutting back on watering too quickly.

Newly planted trees, shrubs, and perennials still need regular moisture while roots establish. Existing plants can also become stressed during dry fall periods.

Deep, less-frequent watering is generally better than frequent shallow watering because it encourages deeper root growth.

Keep checking the soil rather than relying only on cooler air temperatures.

7. Prune Selectively

September is a good time to remove broken, dead, or diseased branches, but avoid heavy pruning on many shrubs and trees.

Some spring-flowering shrubs have already formed next year’s flower buds, and aggressive pruning now could reduce next season’s bloom.

When in doubt, ask before cutting.

8. Make Room for Fall Planting

Once tired plants, weeds, and damaged areas are cleaned up, you may discover new opportunities in the landscape.

September is an excellent time to plant many perennials, trees, and shrubs around the South Shore. Cooler temperatures reduce stress, while warm soil encourages root growth.

This is also the season to begin planting spring-flowering bulbs.

A Better Garden Starts With a September Reset

A few hours of attention in September can make a noticeable difference in both the appearance and health of your landscape.

Clean up declining plants, repair lawn damage, control weeds, check for disease, maintain watering, and take advantage of one of the best planting periods of the year.

Stop by Wyman’s Garden Center in Hanson for fall color, lawn and garden products, soil amendments, seed, and advice on what your yard needs right now.

September Garden Reset FAQ

Is September too early for fall cleanup?
No, but avoid removing everything. Focus on damaged, diseased, or declining material while leaving healthy plants and useful seed heads in place.

Is September a good time to seed the lawn?
Yes. Early fall is generally one of the best periods for seeding and overseeding cool-season lawns in southeastern Massachusetts.

Should I stop watering once the weather cools down?
No. Newly planted material and newly seeded lawns still need consistent moisture.

Can I still plant perennials, trees, and shrubs?
Yes. September is often an excellent planting month because the soil remains warm while air temperatures become more moderate.