September marks a turning point for Montgomery County gardens. Summer heat may linger, but slightly shorter days and the gradual approach of cooler weather give residents an opportunity to revive tired landscapes and prepare for the fall growing season.

For gardeners in Cielo, the month is about more than planting vegetables. It is also a good time to assess heat-stressed trees and shrubs, replenish mulch, plan new landscape additions, refresh flower beds, tend fruit-bearing plants and give lawns the care they need before growth begins slowing later in the fall.

Guidance from the Montgomery County Master Gardeners and Texas A&M AgriLife Extension can help residents decide what to tackle now—and what should wait until temperatures moderate.

What vegetables can be planted in September?

Beans and radishes are among the first vegetables that can be planted during September. Bush, pole, snap and lima beans can go into the garden near the beginning of the month. Radishes may also be planted early, with additional small sowings approximately every two weeks to provide a longer harvest.

The second week of September generally begins the preferred planting window for several cool-season vegetables, including:

• Broccoli
• Cabbage
• Cauliflower
• Collard greens
• Mustard greens

According to the Montgomery County Master Gardeners’ September in the Garden guidance, the optimal planting period for these crops continues through approximately the second week of October.

Late September is better suited for beets, Swiss chard, kohlrabi, English peas and snap peas. While some may be planted earlier, cooler conditions near the end of the month can improve their chances of establishing successfully.

The official Montgomery County Vegetable Garden Planting Chart provides additional planting windows throughout the year.

Prepare garden beds for fall crops

Before sowing seeds or installing transplants, gardeners should clear weeds and remove unhealthy plant material left from the summer garden. Plants showing signs of disease should not be added to a home compost pile unless the composting process reaches temperatures capable of destroying pathogens.

Loosening compacted soil and adding finished compost can improve drainage and help garden beds retain moisture. A soil test can identify nutrient needs and help residents avoid unnecessary fertilizer applications.

New seeds require steady moisture during germination, but soil should not remain saturated. A light layer of mulch around established seedlings can moderate soil temperature, conserve moisture and limit weed growth. Mulch should be kept away from tender stems.

Gardeners can also stagger plantings instead of filling the entire bed at once. Successive sowings of radishes, greens and other quick-growing crops can extend the harvest and reduce the likelihood of having more produce than a household can use at one time.

September fruit care in Montgomery County

September is not the primary planting month for every type of fruit, but it is an important time to inspect existing fruit trees, vines and berry plants while planning future additions.

The Texas A&M AgriLife Extension Guide to Selecting Fruits and Nuts in Montgomery County notes that local conditions are better suited to some fruits than others. Figs, blackberries, pears, Asian persimmons, citrus and certain muscadine grapes can perform well when the proper varieties and growing sites are selected.

Some pears and persimmons ripen during September or early fall. Fruit should be checked regularly and harvested according to the needs of the individual variety. Fallen or damaged fruit should be removed from beneath trees to discourage insects, wildlife and disease.

Home gardeners can also use September to:

• Check fruit trees for broken branches, trunk damage and insect activity.
• Remove fallen or rotting fruit from the ground.
• Maintain even soil moisture around figs and other shallow-rooted plants.
• Inspect citrus leaves for scale, whiteflies and other pests.
• Evaluate drainage before selecting a location for a future fruit tree.
• Research pollination requirements before purchasing new plants.
• Make note of which varieties performed well during the summer.

Fruit selection matters in Montgomery County. Apples and peaches can be more demanding because of disease pressure, drainage requirements and the need to select varieties with appropriate winter chilling requirements. Blackberries and figs are generally more approachable for home gardeners, while rabbiteye blueberries require very acidic soil, good drainage, consistent moisture and compatible varieties for cross-pollination.

Begin planning an October strawberry bed

Montgomery County gardeners generally grow strawberries as annual plants rather than keeping the same plants year after year. According to the county’s fruit guide, new strawberry plants are typically installed in October, maintained through winter and harvested during the following season.

September is therefore a good time to select a sunny, well-drained location and prepare the bed. Strawberries have shallow roots and benefit from sandy, well-drained soil and mulch. Starting with a clean planting area is important because strawberries can be affected by several soilborne diseases.

Locally recommended varieties listed in the guide include Chandler, Selva, Seascape and Sequoia. Availability may vary among local nurseries.

September can begin the fall planting season for trees and shrubs

Fall is considered one of the best seasons for establishing trees, shrubs, perennials and other landscape plants in Texas. Cooler air temperatures reduce stress on new plantings, while the soil generally remains warm enough to support root growth.

September can serve as the planning and preparation stage, particularly while daytime temperatures remain high. Residents can identify bare areas, evaluate how much sun each location receives and select plants suited to Montgomery County’s heat, humidity, rainfall and soil conditions. Planting may be more successful once the weather begins cooling later in September or during October.

When planting a new tree, Texas A&M AgriLife’s Earth-Kind guidance recommends digging a hole approximately twice as wide as the root ball but no deeper than the root ball itself. The original soil removed from the hole should be used as backfill; compost, peat moss and shredded bark are not recommended as amendments inside the planting hole.

The tree’s root flare—the area where the trunk begins widening into the roots—should remain visible rather than being buried beneath soil or mulch. Most newly planted trees also do not need staking unless the trunk cannot remain upright on its own.

Check established trees and shrubs for summer stress

September is a useful time to inspect existing trees and shrubs for signs of heat, drought, insects or disease. Residents should look for:

• Wilting or curling leaves
• Scorched leaf margins
• Premature leaf drop
• Dead or broken branches
• Cracks or wounds in trunks
• Insect activity
• Mushrooms or decay near the trunk or roots
• Soil that remains unusually wet or dry

A struggling plant does not always need more water. Similar symptoms can result from drought, overwatering, root damage or disease. Checking the soil several inches below the surface can provide a better indication of whether irrigation is actually needed.

Trees and large shrubs generally benefit more from slow, deep watering than frequent, shallow sprinkling. Water should be directed over the root zone rather than sprayed against the trunk. Newly planted trees require closer monitoring because their roots have not yet expanded into the surrounding soil.

Residents of Cielo who notice rapid canopy thinning, significant trunk damage or large dead limbs may want to consult the Montgomery County Master Gardeners Help Desk or a certified arborist before taking corrective action.

Avoid unnecessary late-season pruning

September is not the time to give every shrub or tree a major haircut. Heavy pruning can stimulate tender new growth that may not have enough time to mature before cold weather arrives. It can also remove flower buds from shrubs that bloom on older wood.

Dead, broken, diseased or hazardous branches may be removed when necessary. Otherwise, pruning decisions should be based on the particular plant’s growth and flowering cycle.

Before trimming a spring-flowering shrub, residents should determine whether it has already formed next year’s flower buds. Pruning at the wrong time may not kill the plant, but it can greatly reduce its next display of blooms.

Crape myrtles also do not require severe topping. Selective pruning that removes damaged, crossing or poorly positioned branches preserves the tree’s natural form and avoids the dense, weak growth that often follows aggressive cutting.

Refresh mulch around trees, shrubs and flower beds

Mulch is one of the simplest ways to help a landscape transition from summer into fall. Texas A&M AgriLife’s Earth-Kind fall landscaping guidance recommends a two- to four-inch layer of mulch to conserve soil moisture, suppress weeds and moderate soil temperatures.

Organic materials such as shredded bark, wood chips or shredded leaves can be used around trees, shrubs and flower beds. However, mulch should not be piled against trunks or woody stems. Leaving a small open space around the base helps reduce excess moisture, decay and pest problems.

Before adding more mulch, check how much remains from earlier applications. Continually adding new layers without accounting for the old material can create an unnecessarily deep bed.

This is also a good time to redefine bed edges, remove weeds and clear debris that may harbor pests or diseased plant material.

Add fall color and pollinator-friendly plants

As temperatures ease, gardeners can begin replacing annuals that did not survive the summer. Fall annuals and perennials can bring color back to patios, entryways and landscape beds while providing nectar and shelter for pollinators.

Plant selections should match the site rather than relying on appearance alone. Before purchasing a plant, consider:

• The number of hours of direct sunlight
• Mature height and width
• Soil drainage
• Irrigation needs
• Cold tolerance
• Maintenance requirements
• Proximity to buildings, sidewalks and utility lines

Native and well-adapted plants may require less supplemental water and fewer chemical treatments once established. Fall-blooming plants such as native asters, goldenrod, mistflower and ornamental grasses can also support bees, butterflies and other beneficial wildlife.

Gardeners should remember that “low water” does not mean “no water.” New annuals, perennials, shrubs and trees require consistent moisture while their roots become established.

Plant cool-season herbs

September is also a promising time to make room for culinary herbs. The Montgomery County Master Gardeners’ updated Herbsbs for Montgomery County guide identifies several herbs suitable for fall planting:

• Cilantro
• Dill
• Fennel
• Parsley
• Borage

Cilantro and dill can be sown directly in the garden during early fall. Fennel and parsley may also be started in fall, although parsley often germinates slowly.

Containers are a practical option for households with limited growing space. A sunny patio or small outdoor area may provide enough room for parsley, cilantro or dill close to the kitchen.

Give the lawn a September checkup

Warm-season grasses remain active through much of September, so lawns may still require irrigation. The Master Gardeners’ revised 2026 Montgomery County Lawn Care Chart indicates that actively growing turfgrass generally needs approximately one inch of water per week, including measurable rainfall.

Before running the irrigation system, residents can perform a simple “step test.” Walk across the lawn and look back. Grass with sufficient moisture should begin springing upright. If footprints remain visible, irrigation may be needed within the next few days.

Other September lawn tasks include:

• Inspecting sprinkler heads for clogs and uneven coverage
• Adjusting irrigation after rainfall
• Monitoring for chinch bugs and white grubs
• Considering a pre-emergent treatment for cool-season annual weeds
• Testing the soil before applying fall fertilizer
• Checking brown or thinning areas for possible disease

High-nitrogen fertilizer can worsen some fungal problems. Lawns with spreading brown patches or other unexplained damage should be properly diagnosed before fertilizer or fungicide is applied.

Start cleaning up—but leave room for wildlife

Spent annuals, weeds and clearly diseased plant material can be removed as beds are refreshed. Texas A&M AgriLife notes that diseased debris left in the landscape can contribute to problems during the following growing season.

Not every dried stem or seed head needs to disappear, however. Healthy plant material can provide food and shelter for birds, insects and other wildlife. Gardeners can selectively tidy prominent areas while leaving some undisturbed habitat in less visible portions of the yard.

Healthy leaves can also become a resource rather than waste. Shredded leaves may be used as mulch or added to a compost pile, reducing the amount sent to landfills while returning organic matter to the landscape.

Let the weather set the pace

A gardening calendar is a useful guide, but Montgomery County’s actual weather should determine when work begins. If September remains unusually hot and dry, residents may want to delay planting larger shrubs and trees until conditions improve.

By spreading projects throughout the month, gardeners in Cielo can prepare vegetable beds, care for fruit-bearing plants and refresh the broader landscape without trying to complete everything during one weekend.

Residents who need help identifying a plant, insect, lawn disease or tree problem can contact the Montgomery County Master Gardeners Help Desk at 936-539-7824 or mcmga9020@gmail.com. The service provides research-based gardening assistance through Texas A&M AgriLife Extension.

By Tiffany Krenek, My Neighborhood News 

Tiffany Krenek has been on the My Neighborhood News team since August 2021. She is passionate about curating and sharing content that enriches the lives of our readers in a personal, meaningful way. A loving mother and wife, Tiffany and her family live in the West Houston/Cypress region.