May Gardening Guide: Prepare Your Garden for a Beautiful Summer
May is one of the busiest and most rewarding months in the Southern California garden. Longer days and warmer temperatures create ideal growing conditions for vegetables, flowers, shrubs, and trees.
Whether you're planting your summer vegetable garden, refreshing colorful containers, attracting hummingbirds and butterflies, or creating the perfect outdoor living space, May is the month to get growing. From fragrant lavender and blooming roses to patio-ready hanging baskets and pollinator-friendly plants, everything is coming together for a spectacular summer garden.
What’s Taking Root This Month
Your May priorities at a glance.
- Plant warm-season vegetables, herbs, colorful annuals, lavender, and pollinator-friendly flowers for summer growth.
- Keep roses blooming, refresh patios and containers, and prepare lawns and houseplants for warmer weather.
- Mulch planting beds and adjust watering now to help plants stay healthy through Southern California’s summer heat.
What You’ll Find in This May Garden Guide
Fill Your Garden with Summer Color
As spring transitions into summer, now is the perfect time to refresh flower beds, containers, and hanging baskets with plants that love the heat.
Plant colorful favorites like:
- Petunias
- Calibrachoa
- Geraniums
- Vinca
- Marigolds
- Angelonia
- Begonias
- Lantana
- SunPatiens
- Fuchsia hanging baskets
Bright annuals provide continuous blooms throughout summer while attracting butterflies and hummingbirds to your garden.
Tip from Our Garden Experts
Deadhead spent flowers every week to encourage plants to produce even more blooms throughout the season. Regular feeding according to product directions can also help container plants maintain vigorous growth.
Bring Home Summer-Ready Color
Refresh beds, baskets, and containers with colorful annuals selected to perform through Southern California’s warmer months.
Find Your Local ArmstrongPlant Your Summer Vegetable Garden
May is one of the best months to grow fresh vegetables at home.
Warm-Season Vegetables
- Tomatoes
- Peppers
- Cucumbers
- Zucchini
- Squash
- Eggplant
- Pumpkins
- Watermelon
- Beans
Fresh Herbs
- Basil
- Rosemary
- Thyme
- Oregano
- Parsley
- Chives
- Mint
Prepare planting beds with quality planting mix and starter fertilizer according to product directions to encourage deep roots and abundant harvests.
Install tomato cages or stakes when planting to support healthy growth all season long. Adding supports while plants are still small helps avoid damaging roots later.
Give Edibles Room to Grow
Follow recommended spacing for each crop so plants receive good airflow, sunlight, and room for mature growth. Overcrowded vegetables are often more vulnerable to stress, pests, and disease.
Grow Fresh Summer Flavor at Home
Choose vegetables, herbs, planting mixes, fertilizers, and supports to create a productive edible garden in beds or containers.
Visit Our Garden ExpertsLavender, Pollinators & Summer Fragrance
May is lavender season. Whether planted in garden beds, borders, or decorative containers, lavender fills your landscape with fragrance while attracting bees, butterflies, and other beneficial pollinators.
Complete your pollinator garden with:
- Salvia
- Gaura
- Lantana
- Achillea
- Penstemon
- Milkweed
- Agastache
A pollinator-friendly garden supports local wildlife while creating a landscape that's alive with movement and color.
Create a Pollinator-Friendly Habitat
Plant several of the same variety together so pollinators can easily find them. Include flowers with different shapes and bloom periods, and provide a reliable source of fresh water.
Roses Continue Their Spectacular Show
Roses are producing beautiful spring blooms and rewarding gardeners with incredible fragrance and color.
Continue to:
- Deadhead spent flowers.
- Fertilize regularly according to product directions.
- Watch for aphids or fungal issues.
- Water deeply during warmer weather.
Whether you love fragrant hybrid teas, climbing roses, or landscape roses, May is one of the best months to enjoy them.
Refresh Your Outdoor Living Space
Longer evenings mean more time outdoors.
Refresh your patio with:
- Hanging baskets
- Decorative pottery
- Patio furniture
- Outdoor pillows
- Container gardens
- Birdbaths
- Fountains
A few colorful planters near seating areas can instantly transform your backyard into an inviting place to relax or entertain family and friends.
Create an Outdoor Space Made for Summer
Combine colorful containers, pottery, comfortable furniture, water features, and outdoor accents for a patio that feels ready for warm-weather gatherings.
Explore In StoreMulch & Water Before Summer Heat
Preparing now helps your garden thrive through the hottest months ahead.
Apply 2–3 inches of mulch around trees, shrubs, vegetables, and flower beds to:
- Retain soil moisture.
- Reduce weeds.
- Keep roots cooler.
- Improve soil health as organic mulch breaks down.
Keep mulch a few inches away from trunks and plant crowns to avoid trapping excess moisture directly against stems.
Water deeply in the early morning to encourage deeper root systems and healthier plants. Check soil moisture before watering and adjust irrigation as temperatures change.
Houseplants Love Spring Too
Longer days encourage healthy indoor growth.
This month:
- Repot root-bound plants.
- Feed monthly during active growth according to product directions.
- Move suitable tropical plants outdoors into bright shade.
- Monitor watering as temperatures increase.
Healthy houseplants can grow quickly during late spring with just a little extra care. Protect indoor plants from sudden direct sunlight when moving them outside.
Lawn Care for May
Help your lawn stay healthy before summer arrives.
- Feed established lawns when appropriate.
- Control weeds before temperatures become too hot.
- Adjust irrigation schedules as weather warms.
- Water deeply but less frequently to encourage deeper roots.
A healthy lawn provides the perfect backdrop for colorful flower beds and outdoor entertaining.
May Garden Checklist
- Plant tomatoes, peppers, pumpkins, cucumbers, and herbs.
- Refresh flower beds with colorful summer annuals.
- Plant lavender and pollinator-friendly flowers.
- Feed roses for continuous blooms.
- Mulch planting beds before summer heat arrives.
- Refresh patio containers and hanging baskets.
- Feed your lawn as appropriate.
- Water deeply in the early morning.
- Repot houseplants if needed.
- Create an inviting outdoor living space.
Frequently Asked Questions
Answers to common May gardening questions about summer vegetables, flowers, watering, mulch, and pollinator-friendly plants in Southern California.
What should I plant in May in Southern California?
May is perfect for planting tomatoes, peppers, cucumbers, squash, pumpkins, herbs, roses, lavender, flowering annuals, shrubs, and landscape trees.
Is May too late to plant tomatoes?
No. May is still an excellent time to plant tomatoes throughout Southern California and enjoy a productive summer harvest. Newly planted tomatoes will need consistent watering as temperatures rise.
What flowers bloom best in May?
Petunias, calibrachoa, geraniums, marigolds, lantana, angelonia, begonias, lavender, and roses can all thrive and provide beautiful color during May.
How often should I water my garden in May?
Watering frequency depends on the plant, soil, container size, exposure, and local weather. As temperatures warm, check soil moisture regularly and water deeply during the early morning when needed.
Why should I mulch my garden?
Mulch helps conserve moisture, suppress weeds, regulate soil temperature, and improve soil as organic material naturally breaks down.
What attracts hummingbirds and butterflies?
Plant nectar-rich flowers such as lavender, salvia, lantana, penstemon, fuchsia, and agastache. Include a clean source of fresh water and avoid allowing feeders or birdbaths to become dirty.
Prepare Your Garden for a Beautiful Summer
May is the month to build momentum for the summer ahead. Planting warm-season vegetables and flowers, caring for roses and lawns, refreshing outdoor living spaces, and preparing soil with mulch and deep watering can help your garden remain colorful, productive, and healthy through the warmer months.
For recommendations tailored to your garden and local microclimate, visit your local Armstrong Garden Center and speak with one of our garden experts.
