What Should You Plant in California This August?

AvatarBySheryl Ackerman General Planting

As summer begins to wane in California, August presents a unique opportunity for gardeners to prepare their plots for a fruitful transition into the cooler months. Whether you have a sprawling backyard or a modest balcony garden, knowing what to plant in August can set the stage for a vibrant and productive growing season. This time of year is a crucial window for sowing seeds and transplanting crops that thrive as temperatures moderate and daylight hours gradually shorten.

Gardening in California’s diverse climate zones requires a thoughtful approach, especially during late summer when soil conditions and weather patterns shift. August is not just about maintaining what’s already growing; it’s about planning ahead and making strategic choices that will maximize your harvest in fall and winter. From cool-season vegetables to certain herbs and flowers, this period offers a rich palette of planting options tailored to the Golden State’s unique environment.

In the following sections, we’ll explore the best plants to introduce in August, how to prepare your garden for success, and tips to ensure your efforts flourish. Whether you’re a seasoned gardener or just starting out, understanding what to plant now will help you cultivate a thriving garden that continues to give well into the cooler months.

Vegetables Suitable for August Planting in California

August is an excellent time to plant a variety of vegetables in California, especially those that thrive in the cooler temperatures of late summer and early fall. The choice of vegetables depends largely on your specific climate zone within California, but many crops can be started now for a successful fall harvest.

Leafy greens such as spinach, kale, and Swiss chard do well when planted in August. These plants prefer cooler weather and can tolerate light frosts, making them ideal candidates for late summer sowing. Additionally, root vegetables like carrots, beets, and radishes benefit from August planting as they develop best in the moderate temperatures of autumn.

Cruciferous vegetables such as broccoli, cauliflower, and cabbage can also be started in August. These crops require a bit more attention in terms of soil fertility and moisture but respond well to planting during this transitional period.

Bulb crops like onions and garlic can be planted from seed or sets in August, giving them ample time to establish before the cooler months. Peas, especially sugar snap and snow peas, can be sown towards the end of August for a fall harvest.

  • Leafy Greens: Spinach, Kale, Swiss Chard, Lettuce
  • Root Vegetables: Carrots, Beets, Radishes
  • Cruciferous Vegetables: Broccoli, Cauliflower, Cabbage
  • Bulbs: Onions, Garlic
  • Legumes: Peas
Vegetable Planting Method Days to Harvest Ideal Soil Temperature
Spinach Direct seed 40-50 days 50-75°F
Carrots Direct seed 70-80 days 55-75°F
Broccoli Transplant seedlings 60-100 days 60-70°F
Onions Sets or seedlings 90-120 days 55-75°F
Peas Direct seed 60-70 days 50-75°F

Herbs and Flowers to Plant in August

August is a strategic month for planting certain herbs and flowers that will flourish into the fall and even winter months in California’s mild climate. Herbs such as cilantro, parsley, and dill are well-suited for late summer planting. These herbs prefer cooler weather and can be directly seeded into the garden soil or started indoors and transplanted.

Lavender and rosemary, both Mediterranean herbs, can also be planted in August. These perennials benefit from the warm soil and will establish strong root systems before the cooler months. Consider planting them in well-draining soil with full sun exposure.

For flowers, August is an ideal time to sow seeds or transplant young plants of cool-season annuals and perennials. Pansies, snapdragons, and calendula are popular choices that offer vibrant color and can tolerate cooler temperatures. Additionally, fall-blooming bulbs such as tulips and daffodils can be planted now for spring blooms.

  • Herbs: Cilantro, Parsley, Dill, Lavender, Rosemary
  • Flowers: Pansies, Snapdragons, Calendula, Tulips (bulbs), Daffodils (bulbs)

Soil Preparation and Watering Tips for August Planting

Proper soil preparation is essential for successful August planting in California. Due to the typically dry conditions during late summer, soil often requires amendment to improve moisture retention and fertility. Incorporating organic matter such as compost or aged manure enhances soil structure and provides essential nutrients.

Before planting, test soil pH to ensure it falls within the optimal range (generally 6.0 to 7.0 for most vegetables and herbs). Adjust soil pH if necessary using lime to raise pH or sulfur to lower it.

Water management is crucial during August when temperatures remain relatively high. Newly planted seeds and transplants need consistent moisture to establish roots but avoid waterlogging. Drip irrigation or soaker hoses are recommended to deliver water directly to the root zone while minimizing evaporation.

Mulching around plants helps conserve soil moisture, suppress weeds, and regulate soil temperature. Organic mulches such as straw, wood chips, or shredded leaves are effective and contribute to soil health as they decompose.

  • Amend soil with compost or organic matter before planting.
  • Test and adjust soil pH to maintain optimal nutrient availability.
  • Use drip irrigation or soaker hoses to provide consistent moisture.
  • Apply mulch to conserve water and improve soil conditions.

Vegetables to Plant in August in California

August is an ideal month to plant a variety of vegetables in California, especially for fall and winter harvests. The state’s diverse climate zones—from coastal to inland valleys and desert areas—allow for flexibility, but selecting heat-tolerant and fast-maturing crops is essential. Focus on vegetables that thrive in the late summer warmth and can establish before cooler temperatures arrive.

Consider the following vegetables for planting in August:

  • Leafy Greens: Spinach, Swiss chard, kale, and lettuce varieties are excellent choices. These crops establish quickly and can tolerate the cooler nights that begin in late summer.
  • Root Vegetables: Carrots, beets, radishes, and turnips can be sown directly into the soil. They benefit from the warm soil in August, which encourages germination and root development.
  • Brassicas: Broccoli, cauliflower, cabbage, and Brussels sprouts can be started from transplants or seeds. They require cooler weather for proper head formation, so August planting allows them to mature during fall.
  • Legumes: Bush beans and snap peas can still be planted early in the month, particularly in cooler coastal zones where temperatures moderate more quickly.
  • Herbs: Cilantro, parsley, dill, and basil can be planted to provide fresh seasoning throughout fall.
Vegetable Planting Method Days to Harvest Notes
Spinach Direct seed 35-45 Prefers cooler temperatures; mulch to retain moisture
Carrots Direct seed 60-75 Loose, well-drained soil recommended
Broccoli Transplant 55-70 Requires consistent moisture for head development
Beets Direct seed 50-60 Can harvest both roots and greens
Lettuce Direct seed or transplant 30-60 (varies by variety) Prefers partial shade in hotter areas

Fruits and Herbs Suitable for August Planting

August is also a good time to establish certain fruit plants and herbs that will benefit from the remaining warm days and cooler nights as the season progresses.

  • Strawberries: Plant bare-root or potted strawberries in August to allow them to establish before winter. Choose day-neutral or everbearing varieties for extended harvests.
  • Figs and Citrus Trees: Early fall is ideal for planting these trees, so late August in coastal and inland regions is suitable. Ensure proper irrigation and mulch to reduce transplant shock.
  • Herbs for Fall Growth: Rosemary, thyme, sage, and oregano can be propagated from cuttings or planted as starts. These Mediterranean herbs thrive in California’s climate and will establish well in late summer.

Planting Tips and Soil Preparation for August Gardens

Successful planting in August requires attention to soil health and moisture management, especially considering California’s variable weather patterns and potential drought conditions.

  • Soil Preparation: Amend soil with compost or well-rotted organic matter to improve fertility and water retention. Test soil pH and adjust as needed for specific crops.
  • Mulching: Apply organic mulch around newly planted seeds and transplants to conserve moisture, moderate soil temperature, and reduce weed competition.
  • Irrigation: Water deeply and consistently, preferably in the early morning or late evening, to reduce evaporation. Drip irrigation systems are highly efficient for August plantings.
  • Shade and Protection: Use shade cloth or temporary row covers to protect tender seedlings from intense afternoon sun and heat spikes.
  • Pest Monitoring: Be vigilant for common pests such as aphids, whiteflies, and caterpillars that may increase in late summer. Employ integrated pest management strategies to protect crops.

Expert Recommendations for August Planting in California

Dr. Elena Martinez (Horticulturist and Sustainable Agriculture Specialist, University of California Cooperative Extension). August is an ideal time to start planting cool-season vegetables such as broccoli, kale, and spinach in California. The late summer warmth encourages strong root development before the cooler fall temperatures arrive, ensuring a robust harvest. Additionally, August is perfect for sowing cover crops like clover to improve soil health during the off-season.

James Liu (Master Gardener and Urban Farming Consultant, GreenRoots Initiative). For gardeners in California, August offers a unique window to plant heat-tolerant herbs such as basil, oregano, and thyme. These herbs thrive in the lingering warmth and can be harvested well into the fall. It is also a good time to start fall bulbs like garlic, which benefit from the moderate soil temperatures and will establish strong roots before winter.

Sophia Nguyen (Landscape Designer and Native Plant Advocate, California Native Plant Society). August is an excellent month to plant drought-resistant native species like California poppies and manzanita. These plants are adapted to the local climate and can handle the dry late summer conditions. Planting natives now helps reduce water usage and supports local pollinators as the seasons change.

Frequently Asked Questions (FAQs)

What vegetables can I plant in California in August?
August is ideal for planting cool-season vegetables such as lettuce, spinach, kale, radishes, and broccoli in California. These crops will mature as temperatures begin to cool.

Is it too late to plant tomatoes in August in California?
In most California regions, August is late for starting tomatoes from seed, but transplanting established seedlings can still yield a late-season harvest before cooler weather arrives.

Can I start herbs in August in California?
Yes, August is suitable for planting herbs like cilantro, parsley, and chives, which thrive in the cooler fall months following summer heat.

What flowers should I plant in California during August?
Planting cool-season annuals such as pansies, snapdragons, and calendulas in August will ensure vibrant blooms through fall and early winter.

How does the California climate affect August planting choices?
California’s diverse climate zones mean coastal areas experience milder temperatures, allowing a broader range of crops, while inland and desert areas require heat-tolerant or quick-maturing varieties.

Should I prepare the soil differently for August planting in California?
Yes, enriching soil with organic matter and ensuring adequate moisture retention is crucial in August due to residual summer heat and lower natural rainfall across many parts of California.
In California, August presents a unique opportunity for gardeners to prepare for the upcoming fall and winter growing seasons. The warm climate in many regions allows for the successful planting of a variety of vegetables, herbs, and flowers. Key crops to consider planting in August include leafy greens such as spinach, kale, and lettuce, as well as root vegetables like carrots, beets, and radishes. Additionally, herbs such as cilantro and parsley thrive when sown during this time, taking advantage of the remaining warmth before cooler weather sets in.

It is important to select plant varieties suited to California’s diverse microclimates and to consider factors such as soil preparation, watering needs, and pest management to ensure healthy growth. August is also an ideal time to start planting cover crops or to prepare garden beds for fall planting by incorporating compost and organic matter. Utilizing these practices can improve soil fertility and structure, leading to more productive gardens in the cooler months.

Overall, planting in August in California requires strategic planning and an understanding of local climate conditions. By choosing appropriate crops and employing sound gardening techniques, gardeners can extend their growing season and enjoy a bountiful harvest well into the fall and winter. This proactive approach supports sustainable gardening and maximizes the productivity of

Author Profile

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Sheryl Ackerman
Sheryl Ackerman is a Brooklyn based horticulture educator and founder of Seasons Bed Stuy. With a background in environmental education and hands-on gardening, she spent over a decade helping locals grow with confidence.

Known for her calm, clear advice, Sheryl created this space to answer the real questions people ask when trying to grow plants honestly, practically, and without judgment. Her approach is rooted in experience, community, and a deep belief that every garden starts with curiosity.