Heat Tolerant Varieties | Johnny's Selected Seeds

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149 Products

Heat Tolerant

Varieties labeled as “heat tolerant” will perform relatively well (compared to other varieties within their crop group) when exposed to hot weather. The Johnny’s Research Team assigns the Heat Tolerant symbol to individual varieties within crop groups that traditionally do not perform well in the heat (as opposed to warm season crops that thrive in the heat); we do this to guide growers to more suitable options. In addition to trialing heat-tolerant versions of cool-weather crops such as broccoli, cauliflower, and lettuce, we also seek out highly heat-tolerant versions of warm weather crops; for example, tomatoes that demonstrate the ability to set fruit even under heat stress. See individual product copy descriptions for variety-specific information.

Selecting Varieties for Heat Tolerance

149 Products

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Bishop Standard Cauliflower

Bishop

(F1) Cauliflower Seed

Improved Fremont-type hybrid for summer and fall crops.

Lalique Summer Crisp Lettuce (Batavia)

Lalique

Pelleted Lettuce Seed

Crunchy sandwich-sized leaves with year-round performance.

Green River Asian Greens

Green River

(F1) Asian Green Seed

Upright, refined komatsuna for bunching and baby leaf.

Flame Star Standard Cauliflower

Flame Star

(F1) Cauliflower Seed

Pastel orange cauliflower with improved heat tolerance.

Paxton Standard Cauliflower

Paxton

(F1) Cauliflower Seed

Resistance to club root.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Pelleted Lettuce Seed

Versatile mini romaine with sweet flavor.

Bella Verde Mini Broccoli

Bella Verde

(F1) Broccoli Seed

High yields and excellent flavor.

Southern Giant Curled Mustard Greens

Southern Giant Curled

Mustard Green Seed

Our recommended sub for Green Wave.

Tendita Romaine Lettuce (Cos)

Tendita

Pelleted Lettuce Seed

Crunchy, snackable, stackable mini cosberg.

Sweet Bunch Mini Broccoli

Sweet Bunch

(F1) Broccoli Seed

Early variety for spring and summer sales.

Red Splendor Mustard Greens

Red Splendor

Mustard Green Seed

Dark red and green, deeply lobed leaves.

Breen Romaine Lettuce (Cos)

Breen

Pelleted Lettuce Seed

Early producer of truly compact mini heads with bronze-red color.

Casey Butterhead Lettuce (Boston)

Casey

Pelleted Lettuce Seed

Improved butterhead for CEA summer slot.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Pelleted Lettuce Seed

Crunchy rib with an iceberg look.

Twister Standard Cauliflower

Twister

(F1) Cauliflower Seed

Superior wrap and adaptability.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Lettuce Seed

Slow bolting and upright with great flavor.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Lettuce Seed

Versatile mini romaine with sweet flavor.

Tendita Romaine Lettuce (Cos)

Tendita

Lettuce Seed

Crunchy, snackable, stackable mini cosberg.

Volcana Bibb Lettuce

Volcana

Pelleted Lettuce Seed

Red-to-the-heart mini.

Tropicana Lettuce

Tropicana

Organic Pelleted Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Bluerock Romaine Lettuce (Cos)

Bluerock

Organic Pelleted Lettuce Seed

Classic romaine with modern disease resistance.

Breen Romaine Lettuce (Cos)

Breen

Organic Pelleted Lettuce Seed

Early producer of truly compact mini heads with bronze-red color.

Tropicana Lettuce

Tropicana

Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Red Kingdom Asian Greens

AAS (All-America Selections) Winners

Red Kingdom

(F1) Asian Green Seed

Dark purple leaf with bright green stem.

Golden Frills Mustard Greens

Golden Frills

Mustard Green Seed

Bright green, intricately serrated leaves with spicy flavor.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Lettuce Seed

Crunchy rib with an iceberg look.

Bluerock Romaine Lettuce (Cos)

Bluerock

Organic Lettuce Seed

Classic romaine with modern disease resistance.

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Panisse Oakleaf Lettuce

Panisse

Lettuce Seed

Large bright green oakleaf with dense heads and long harvest window.

Amadeus Standard Broccoli

Amadeus

(F1) Broccoli Seed

Early for spring sowings, yields medium-sized, fancy heads.

Red Cross Butterhead Lettuce (Boston)

Red Cross

Organic Pelleted Lettuce Seed

Large and fancy, heat tolerant red butterhead for stunning display.

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

Slow-bolting, flavorful, one-cut red leaf lettuce.

Sale

Carlton Asian Greens

Carlton

(F1) Asian Green Seed

Very dark green komatsuna with good heat and cold tolerance.

Sale

Breen Romaine Lettuce (Cos)

Breen

Lettuce Seed

Early producer of truly compact mini heads with bronze-red color.

Sale

Cristabel CrunchLeaf Lettuce

Cristabel

Pelleted Lettuce Seed

Extra-crunchy complement to Azirka.

Sale

Azirka CrunchLeaf Lettuce

Azirka

Pelleted Lettuce Seed

Extra-crunchy complement to Cristabel.