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August 5, 2026 - Maintaining Growth vs Hitting the Brakes

Late season considerations for your garden.

As the summer growing season draws to a close, gardeners face a series of choices. Different plants require completely different management strategies during this transition window. For annual plants, the focus remains on maintaining growth and getting a full harvest of mature product. For perennials and woody trees or shrubs, the focus is on letting them slow down naturally to build up strength and resilience for winter. Navigating this critical period requires specific strategies for watering, fertilizing, pest management, and soil preparation to manage these competing needs in the yard.

Annual vegetables and some seasonal fruiting plants have high water requirements right up until they are finished growing. Most vegetables benefit from an inch (2.5cm) of water per week through rainfall or irrigation to maintain their quality and yield. Most vegetables will need water up until harvest unless they need to dry down (e.g. garlic, onions). In late summer, actively growing plants like strawberries, raspberries, and late-planted vegetables still require a regular supply of moisture, although the necessary volume may be slightly less than during the peak summer heat. Actively fruiting crops like day-neutral strawberries must have consistent water until the harvest is completely finished.

Maintaining this active growth also requires some particular attention to pest management. Weeds, diseases, and insects can stick a wrench into active growth, or undo a whole season of growth. Control weeds to avoid competition, and to reduce the potential for increased humidity and prolonged leaf wetness, which lead to disease. Insects can also ruin a crop.

Horticulturist Robert Spencer outlines the danger of neglecting maintenance around actively growing crops. “Keep on top of the annual weeds, removing them before they set seed, and keep perennials from establishing a toe hold. Weedy gardens also tend to have higher humidity around the plant, which can lead to more disease issues.”

Ensuring clear airflow between and around annual plants prevents stagnant conditions, helping to reduce common late-season issues like powdery mildew and slug damage.

For many perennial and woody plants, continuing to supply abundant resources may lead to damage over winter. If moisture and nutrients are readily available or are continued to be supplied, certain crops will continue to grow late into the season. This puts them at risk of delayed dormancy and serious winter injury.

To encourage herbaceous perennials and woody plants to shut down naturally, gardeners should cut back on watering in mid- to late-August. This would include things like apples, bush fruit, or most deciduous trees. For evergreens, you can water them into fall, but you should be careful about overwatering and should focus on just topping up hydration before things freeze up.

Fertilization must also be managed carefully to ensure plants stop growing in time for winter. Fertilizers should generally be applied in spring, not fall. Applying nutrients late in the season prevents plants from shutting down for the winter, leaving them vulnerable to severe cold damage. If you are applying composted manures or other organic matter, fall is the best time, as the release of nutrients is delayed, so won’t hurt things.

For specific annual crops like potatoes and bulb vegetables, a deliberate drop in water is a necessary strategy to prepare the harvest for long-term storage. When onions show signs of maturity, such as their tops falling over, or when potatoes begin to die down, water levels should be scaled back. This allows the plant tissues to dry down, firm or tighten up, and heal wounds properly before they are moved into appropriate storage conditions.

Once woody perennial trees and shrubs have successfully stopped their active seasonal growth and begun transitioning, they require a final, heavy drink of water. Ensuring that conifers and deciduous shrubs enter dormancy fully hydrated protects their foliage and branches from the drying winds and extreme cold temperatures of winter. To properly hydrate these trees, water should be applied deeply out at the "dripline", which is the outer edge of the tree canopy where the active, fine roots are located, rather than applying the water directly next to the trunk.

As annual crops are harvested and the garden beds are emptied, gardeners can pivot to late-season soil maintenance. This is the optimal time to add organic amendments, such as composted manure or well-rotted compost, across the surface and work it in deeply.

Spencer explains why adding high volumes of organic matter makes sense during this specific seasonal shift. “Adding these types of amendments in the fall makes sense since they are typically added in high volumes. They also need to be incorporated into the soil so that they then have time to break down. The winter is a good time for them to start becoming part of the overall soil profile.”

For some beds, you might leave the ground unworked or rough textured to encourage an increase in snow collection over the winter. This process naturally improves soil structure, helps the ground hold water, and establishes long-term nutrients for the following spring.

For each of these considerations, it is really important to understand each of the plants that you are growing, in terms of their growing habits, needs, and challenges, to support them and avoid creating difficulties for any of them.