Heat Tolerant Varieties | Johnny's Selected Seeds

Skip to main content Skip to footer content

0

View Cart

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

Sort By:

Green River Asian Greens

Green River

(F1) Asian Green Seed

Upright, refined komatsuna for bunching and baby leaf.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Lettuce Seed

Slow bolting and upright with great flavor.

Bella Verde Mini Broccoli

Bella Verde

(F1) Broccoli Seed

High yields and excellent flavor.

Salvius Romaine Lettuce (Cos)

Salvius

Lettuce Seed

Bolt tolerant, widely adaptable with open habit suited for heads.

Song TJS-65 Green Stem Cauliflower

Song TJS-65

(F1) Cauliflower Seed

Early and sweet.

Tendita Romaine Lettuce (Cos)

Tendita

Pelleted Lettuce Seed

Crunchy, snackable, stackable mini cosberg.

Salanova® Hydroponic Red Sweet Crisp Salanova® Lettuce

Salanova® Hydroponic Red Sweet Crisp

Pelleted Lettuce Seed

Slow bolting and great shelf-life.

Salanova® Hydroponic Green Sweet Crisp Salanova® Lettuce

Salanova® Hydroponic Green Sweet Crisp

Pelleted Lettuce Seed

High-yielding, crispy green leaf with excellent shelf-life.

Red Giant Mustard Greens

Red Giant

Mustard Green Seed

Very slow-bolting broadleaf mustard.

Southern Giant Curled Mustard Greens

Southern Giant Curled

Mustard Green Seed

Our recommended sub for Green Wave.

Flame Star Standard Cauliflower

Flame Star

(F1) Cauliflower Seed

Pastel orange cauliflower with improved heat tolerance.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Lettuce Seed

Versatile mini romaine with sweet flavor.

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.

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.

Bluerock Romaine Lettuce (Cos)

Bluerock

Organic Lettuce Seed

Classic romaine with modern disease resistance.

Red Kingdom Asian Greens

AAS (All-America Selections) Winners

Red Kingdom

(F1) Asian Green Seed

Dark purple leaf with bright green stem.

Casey Butterhead Lettuce (Boston)

Casey

Pelleted Lettuce Seed

Improved butterhead for CEA summer slot.

Golden Frills Mustard Greens

Golden Frills

Mustard Green Seed

Bright green, intricately serrated leaves with spicy flavor.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Pelleted Lettuce Seed

Versatile mini romaine with sweet flavor.

Twister Standard Cauliflower

Twister

(F1) Cauliflower Seed

Superior wrap and adaptability.

Paxton Standard Cauliflower

Paxton

(F1) Cauliflower Seed

Resistance to club root.

Volcana Bibb Lettuce

Volcana

Pelleted Lettuce Seed

Red-to-the-heart mini.

Amadeus Standard Broccoli

Amadeus

(F1) Broccoli Seed

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

Tropicana Lettuce

Tropicana

Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Lettuce Seed

Crunchy rib with an iceberg look.

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

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

Riptide Romaine Lettuce (Cos)

Riptide

Organic Pelleted Lettuce Seed

Crunchy rib with an iceberg look.

Red Cross Butterhead Lettuce (Boston)

Red Cross

Organic Pelleted Lettuce Seed

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

Sale

Breen Romaine Lettuce (Cos)

Breen

Lettuce Seed

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

Sale

Carlton Asian Greens

Carlton

(F1) Asian Green Seed

Very dark green komatsuna with good heat and cold tolerance.

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.

Green Wave Mustard Greens

AAS (All-America Selections) Winners

Green Wave

Organic Mustard Green Seed

Our spiciest green mustard.

Out Of Stock