Many gardeners assume summer is a poor time to plant, but that is not always true. Spring and fall are often easier because of cooler temperatures and more consistent rainfall, yet planting in summer can still be successful with the right approach.
Hot weather increases water loss and places additional stress on new roots, so summer planting requires careful plant selection, proper soil preparation, and consistent watering.
With good planning, you can successfully plant flowers, shrubs, trees, vegetables, and herbs during the warmer months.
This guide explains what to plant in summer, how to prepare the site, how often to water, and which mistakes to avoid so your new plants can establish successfully.
Is Summer Really a Bad Time to Plant?
Spring and fall are often considered the best planting seasons because cooler air temperatures, moderate soil conditions, and more frequent rainfall reduce stress on newly planted vegetation.
Summer conditions are different.
High temperatures increase evaporation and can cause newly planted roots to dry out before they become established. However, this does not mean summer planting should be avoided entirely.
It simply requires more attention to moisture and heat protection.
Your local climate and USDA hardiness zone also matter. Gardeners in hot, dry regions may need to provide more frequent watering and temporary shade. In cooler northern climates, summer temperatures may be mild enough for planting with fewer adjustments.
Understanding your local growing conditions can help you determine how much additional care your plants will need.
What to Plant in Summer
Many plants can establish successfully during summer when they are chosen carefully and watered consistently.
Flowers for the Summer Garden
Heat-tolerant annuals and perennials are among the easiest plants to establish during warm weather.
Good options include:
- Zinnias
- Marigolds
- Coneflowers
- Black-eyed Susans
These plants generally tolerate heat well and can continue blooming throughout the growing season.
When planting during summer, container-grown plants are usually a better choice than bare-root plants because their root systems are already established in soil and are less vulnerable to drying out.
Bare-root perennials are generally better planted during cooler seasons.
Shrubs That Handle Summer Heat
Many container-grown shrubs can also be planted successfully during summer.
Popular choices include:
- Boxwood
- Spirea
- Hydrangea
- Juniper
The most important step is deep watering immediately after planting and maintaining consistent soil moisture during the establishment period.
Summer is generally not the best time to transplant an established shrub from one part of the yard to another. Moving a mature plant causes significant root disturbance and is usually better done in spring or fall.
Trees for Summer Planting
Can you plant trees in summer? Yes.
Planting trees in summer is common, especially when using healthy container-grown trees.
However, newly planted trees require more attention during hot weather because their roots have not yet spread into the surrounding soil.
Trees such as:
- Maples
- Oaks
- Crape myrtles
can often be planted successfully during summer when they receive deep, regular watering.
A slow-release watering bag or tree watering system can help keep the root zone consistently moist during the first several weeks.
Avoid allowing the soil to dry completely while the tree is establishing.
Vegetables and Herbs
Summer is also a productive season for vegetable and herb gardens.
When spring crops such as lettuce, spinach, and radishes finish producing, the empty garden space can be replanted with warm-season crops.
Good summer vegetables include:
- Beans
- Cucumbers
- Summer squash
- Carrots
Many of these crops germinate quickly in warm soil.
Herbs such as basil and dill also grow well during summer.
Cilantro can be grown during cooler parts of the season, although it tends to bolt quickly in very hot weather.
Preparing the Site for Summer Planting
Proper site preparation is especially important when planting during hot weather.
New plants have less time to recover from planting stress before they begin losing moisture through their leaves.
Start by digging a planting hole that is wide enough for the roots to spread naturally.
Before placing the plant in the hole, check the soil drainage. You can add water to the hole and observe how quickly it drains.
Soil that remains saturated for long periods may cause root problems, while extremely dry soil may require additional preparation and watering.
Loosen compacted soil around the sides of the planting hole so roots can grow outward rather than remain confined.
After placing the plant at the correct depth, refill the hole with soil and water thoroughly.
Apply approximately 2 to 3 inches of organic mulch around the plant.
Mulch helps:
- Reduce evaporation
- Moderate soil temperature
- Suppress weeds
- Protect soil moisture
- Reduce competition around new roots
Keep mulch several inches away from the trunk or main stem to avoid excess moisture against the plant.
Watering New Plants During Summer
Watering is one of the most important factors in successful summer planting.
Newly planted vegetation usually requires more frequent watering than established plants because the roots are still concentrated near the original root ball.
A general watering schedule may look like this:
| Time Since Planting | Suggested Watering Frequency | Notes |
|---|---|---|
| Weeks 1 to 2 | Daily or every other day during extreme heat | Water deeply around the root zone |
| Weeks 3 to 4 | Every 2 to 3 days | Check soil moisture before watering |
| Week 5 and beyond | About 1 to 2 times per week | Reduce as roots establish and rainfall increases |
These are general guidelines rather than strict rules.
Weather, soil type, plant species, sun exposure, and rainfall all affect watering needs.
Always check the soil before adding more water.
The soil should remain evenly moist but not constantly saturated.
When Is the Best Time to Water?
Early morning is usually the best time to water during summer.
Morning watering gives the soil time to absorb moisture before temperatures rise and evaporation increases.
Evening watering can also be effective, although leaves should not remain wet for extended periods when possible.
Direct water toward the soil and root zone rather than spraying the foliage.
Watering deeply encourages roots to grow downward and helps plants become more drought-resistant over time.
Protecting New Plants From Summer Heat
New plants may experience transplant shock after being moved from a container into the landscape.
Common signs include:
- Temporary wilting
- Mild leaf drop
- Slowed growth
- Drooping leaves
These symptoms do not always mean the plant is dying.
If the stems remain healthy and the soil contains adequate moisture, the plant may simply be adjusting to its new environment.
To reduce transplant stress:
- Plant on a cloudy day when possible.
- Plant in the early morning or evening.
- Water thoroughly immediately after planting.
- Provide temporary afternoon shade during extreme heat.
- Avoid disturbing the root ball unnecessarily.
Giving new plants protection during their first few days can improve their chances of successful establishment.
Common Mistakes to Avoid When Planting in Summer
Summer planting can work well, but several common mistakes can make establishment more difficult.
Planting Bare-Root Plants
Bare-root trees, shrubs, and perennials lose moisture quickly during hot weather.
Container-grown plants are generally safer choices for summer planting because their roots remain surrounded by soil.
Save bare-root planting for spring or fall when temperatures are cooler.
Watering Only the Leaves
Spraying the foliage may make a plant look wet without providing enough water to the roots.
New plants need moisture in the root zone.
Water slowly and deeply around the base of the plant.
Skipping Mulch
Uncovered soil can heat up quickly and lose moisture through evaporation.
A layer of mulch helps keep the root zone cooler and reduces how often the plant needs watering.
Fertilizing Immediately After Planting
Newly planted roots are already under stress.
Applying fertilizer immediately may encourage top growth before the root system is ready to support it.
Allow the plant time to establish before fertilizing unless specific plant-care instructions recommend otherwise.
Overwatering
Summer heat does not mean plants should remain constantly wet.
Waterlogged soil can reduce oxygen around the roots and contribute to root rot.
Check soil moisture before watering again.
Leaving Without a Watering Plan
New plants may struggle if they go several hot days without water.
If you plan to travel, use:
- An irrigation timer
- Drip irrigation
- A slow-release watering system
- Help from a neighbor or gardener
Consistent moisture during the establishment period is critical.
Additional Tips for Successful Summer Planting
A few additional practices can make summer planting easier.
Choose Healthy Plants
Select nursery plants with:
- Healthy green foliage
- Strong stems
- No obvious pest damage
- No severe wilting
- Roots that are not excessively crowded
Starting with healthy plants improves the chances of successful establishment.
Avoid Planting During Extreme Heat
If possible, avoid planting during heat waves or periods of unusually high temperatures.
Waiting a few days for cooler conditions can significantly reduce stress on new plants.
Provide Temporary Shade
Shade cloth or another temporary covering can help protect sensitive plants from intense afternoon sun during their first several days in the landscape.
Remove the protection gradually as the plant adjusts.
Keep Weeds Under Control
Weeds compete with new plants for moisture and nutrients.
Keeping the planting area clear gives new roots better access to available water.
Monitor Plants Regularly
Check new plantings frequently during the first few weeks.
Look for:
- Wilted foliage
- Dry soil
- Yellowing leaves
- Pest activity
- Broken stems
- Signs of disease
Early detection makes many problems easier to correct.
Conclusion
Planting in summer can be successful when you adjust your approach to hot weather.
Choose healthy container-grown plants, prepare the soil properly, water deeply and consistently, apply mulch, and protect new plants from extreme heat.
Flowers, shrubs, trees, vegetables, and herbs can all establish during summer when their moisture needs are carefully managed.
The key is not avoiding summer planting altogether. It is understanding that new plants require more attention during their first few weeks.
If you are planning a summer landscape project and want professional support, Mile High Lifescape can help with plant selection, installation, and ongoing landscape care.
Serving homeowners throughout the Denver Metro area, call (303) 877-9091 to discuss your next landscaping project.