May is the month when the gardening season shifts into high gear across most of the country. In cold-winter zones, the last frost is finally behind us, and it's time to get warm-season crops in the ground. In mild-winter zones, the garden is already humming, and the focus turns to keeping up with rapid spring growth. And in the warmest zones, the race is on to get heat-lovers established before summer temperatures take over. Whatever your zone, May is a month of momentum.
Zones 1-7a: May is the main planting kickoff in cold-winter zones, when gardens finally move from starts and prep into full outdoor action. Early May often still favors hardy transplants and direct-sown cool-season crops, while mid-to-late May is when many areas can safely set out warm-season plants as frost risk drops. Keep hardening off seedlings, use row cover if nights run cold, and focus on steady watering and early weed control so young plants establish quickly.
Zones 7b-9a: May is prime warm-season planting time in mild-winter zones, with soil temperatures rising and growth accelerating. This is the month to get main-season crops established outdoors, keep up with succession sowing, and set up supports before vines and tall plants take off. Watch moisture as days warm, mulch to hold soil moisture, and keep an eye out for the first big flush of pests as the garden hits its stride.
Zones 9b-12: May marks the shift into early summer conditions in the warm-winter zones, and gardens respond fast with rapid growth. Warm-season crops should be planted and growing strongly now, and succession sowing keeps harvests coming even as temperatures climb. Stay ahead of heat stress by mulching, watering consistently, and planting in the coolest part of the day - and in the hottest areas, begin planning for shade cloth and other summer protection.
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![Legend: H for Heirloom, O for Organic, A for AAS Winner, F for staff favorites]()
Echinacea Seeds - Cheyenne Spirit
70-80 days maturity. Echinacea x hybrida. Echinacea Cheyenne Spirit Seeds. Non-GMO, Heirloom, Perennial. Echinacea grows as a warm-season perennial and flowering herb native to Central North America. This vigorous echinacea...
All Perennial Flower Seeds Mix
50-65 Days to maturity. All Perennial Mix Wildflower Seeds. Non-GMO perennials. Custom blended wildflower mix full of exclusively gorgeous perennials! This mixture is for ornamental landscaping. These plants can be...
Cosmos Seeds - Bright Lights
56-63 days. Bright Lights cosmos seeds grow a playful, robust, and familiar annual sown among sunflowers and wildflowers. Bright Lights seeds grow hardy, drought tolerant cosmos shrubs as high as...
Zinnia Seeds - State Fair Mix
60 - 80 days. Zinnia elegans. Annual. State Fair Mix Zinnia seeds grow some of the tallest and brightest Zinnias growing this summer. State Fair Mix Zinnia seeds deliver brilliant...
Zinnia Seeds - Thumbelina Mixture
60-70 Days to maturity. Zinnia elegans. Thumbelina Mix Zinnia Seeds. Non-GMO, AAS Winner, annual. Thumbelina Mix Zinnia flower seeds are a small, adorable, and vibrant addition to grow in any...
Coleus Seeds - Rainbow Mixture
84-91 Days to maturity. Plectranthus scutellarioides. Coleus Rainbow Mixture Seeds. Non-GMO, Annual. Rainbow Mix coleus seeds are a fun plant for many gardens across the country. Rainbow Mix seeds grow...
Tomato Seeds - Slicing - Heirloom Rainbow Blend (Organic)
80-100 Days to maturity (from transplant). Solanum lycopersicum. Organic Heirloom Rainbow Blend Tomato Seeds. Non-GMO, warm season annual, organic, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots,...
Gourds Seeds - Large Mix
100-120 days. Lagenaria sp. Mix of many large type Lagenaria gourds. Approximately 255 seeds/oz.; with sprawling vines, gourds require widespread areas for growth; rows can be planted 2 - 3...
Wildflower Seeds - Partial Shade Mix
Partial Shade Mix wildflower seeds grow some of the season's most inspired, classic, and lasting blooms. Partial Shade Wildflower Mix seeds contain a blend of 19 partial-sun varieties of wildflowers...
Gourds Seeds - Small Mix
Small Gourds Mix is ready in 90-120 days. This is a collection of different shapes in shades of white, cream, gold, yellow, and green. These gourds are suitable for decoration....
Radish Seeds - Easter Egg Blend
Non-GMO Easter Egg Blend Radish Seeds, Heirloom. Easter Egg Blend Radish Seeds are native to regions in Asia and were grown in Europe around 5,000 years ago. Freshly eaten radishes...
Calendula Seeds - Solar Flashback Mix - Organic
50-60 Days to maturity. Calendula officinalis. Solar Flashback Mix Calendula Seeds. Non-GMO, Organic, Annual. Solar Flashback Mix Calendula flowers are a distinctive new family of flash calendulas, selected to highlight...
Pepper Seeds - Sweet - Mini Belle Mix
60-69 Days to maturity (from transplant). Capsicum annuum. Mini Belle Mix Pepper Seeds. Non-GMO, annual, open-pollinated, sweet pepper with no heat levels. 0 Scoville Heat Units. Suitable for growing in...
Coleus Seeds - Jazz Combo Mix
84-91 Days to maturity. Plectranthus scutellarioides. Coleus Jazz Combo Mix Seeds. Non-GMO, Annual. Jazz Combo Mix coleus seeds are uniquely exciting and fun to grow in any home or garden....
Wildflower Seeds - Dry Land Mix
Annual and perennial mix. Dry Land Mix wildflower seed grows some of the season's most classic, colorful, and fragrant collection of blooms. Dryland Mix wildflower seeds contain a unique mix...
Strawflower Seeds - Tall Double Mix
70-84 Days to maturity. Helichrysum bracteatum. Strawflower Tall Double Mix Seeds. Non-GMO, Annual. Tall Double Mix strawflower seeds grow some of the most recognizable summertime blooms, both indoors and out!...
Sweet William Seeds - Double Mixture
105-112 days to maturity. Dianthus barbatus. Dianthus Double Mixture Seeds. Non-GMO, Annual, or Biennial. Ornamental. Double Mix Sweet William seeds promise elegant 3-5 inch blooms of crimsons, scarlets, and pinks...
Wildflower Seeds - Monarch Butterfly Mix
Monarch Butterfly Mix. Garden Flower Mix. 13 Varieties of Assorted Flower Seeds. Ornamental. Heirloom. Non GMO. Assorted mix of 13 varieties of wildflowers including Butterfly Milkweed, Aster, Purple Coneflower, Rocket...
Four O Clock Seeds - Marvel of Peru Mix
91-105 Days to maturity. Mirabilis jalapa. Marvel of Peru Seeds. Non-GMO. Open-Pollinated. Ornamental. Annual or Perennial. Marvel of Peru seeds easily grow eye-catching and fragrant four o'clock flowers bursting with...
Pepper Seeds - Hot - Caribbean Blend
60-69 Days to maturity (from transplant). Capsicum chinense. Caribbean Blend Pepper Seeds. Non-GMO, annual, open-pollinated, high yielding, deer resistant, heat tolerant, drought tolerant, hot pepper with extra hot heat levels....
Aster Seeds - Powderpuff Mix
91-105 Days to maturity. Callistephus chinensis. Powderpuff Mix Aster Seeds. Non-GMO, Ornamental, Annual. Powderpuff Mix Aster flower seeds are a tidy and vibrant addition to grow in any home or...
Flower Seeds - Beneficial Bug Mix
Bring helpful bugs into your garden with this beautiful mixture of garden flowers, wildflowers and herbs. The Beneficial Bug Mix is designed to attract lacewings, lady beetles, hover flies, syrphid...
Beet Seeds - Gourmet Blend
50-60 days. Beta vulgaris. Gourmet Blend Beet Seeds. Non-GMO, annual, open-pollinated. This crop is suitable for garden plots, raised beds, and containers. A colorful five-variety mix—Bull's Blood, Detroit Dark Red,...
Aster Seeds - Crego Giant Mixture
91-105 Days to maturity. Callistephus chinensis. Crego Giant Mixture Aster Seeds. Non-GMO, Ornamental, Annual. Open-pollinated flower seeds. Crego Giant Mix Aster flower seeds grow a playful, robust, and familiar looking...
Morning Glory Seeds - Mixed Colors
112 Days to maturity. Ipomoea purpurea. Mixed Colors Morning Glory Seeds. Non-GMO, annual. Morning glory seeds are an essential and decorative plant for your summertime garden, home, or patio. Annual...
Lettuce Seeds - Heatwave Mix - Organic
The Heatwave Lettuce Mix lettuces that thrive in the heat and remain productive. Our choice" slow-bolt" varieties such as Great Lakes, Iya Sol, and Oakleaf Royal. These lettuce types texture...
Tomato Seeds - Slicing - Heirloom Rainbow Blend
80-100 Days to maturity (from transplant). Solanum lycopersicum. Heirloom Rainbow Blend Tomato Seeds. Non-GMO, warm season annual, open-pollinated, heirloom, indeterminate, slicing tomato. Suitable for growing in garden plots, raised beds,...
Cleome Seeds - Queen Mixture
70-77 Days to maturity. Cleome hassleriana. Cleome Queen Mixture Seeds. Non-GMO, annual. Ornamental. Queen Mixture cleome seeds grow one of summer's most unique, exciting, and eye-catching blooms found in any...
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