Heat Tolerant Varieties | Johnny's Selected Seeds

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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

168 Products

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Tessaury Standard Cauliflower

Tessaury

Organic (F1) Cauliflower Seed

Heat-tolerant organic cauliflower.

Reno Summer Crisp Lettuce (Batavia)

Reno

Pelleted Lettuce Seed

Exceptional heat tolerance.

Breen Romaine Lettuce (Cos)

Breen

Pelleted Lettuce Seed

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

Cristabel CrunchLeaf Lettuce

Cristabel

Pelleted Lettuce Seed

Extra-crunchy complement to Azirka.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Lettuce Seed

A red Summer Crisp with good flavor.

Rhone One-Cut Lettuce

Rhone

Organic Pelleted Lettuce Seed

Organic one-cut with spiky bronze leaves and great yields.

Bishop Standard Cauliflower

Bishop

(F1) Cauliflower Seed

Improved Fremont-type hybrid for summer and fall crops.

Tropicana Lettuce

Tropicana

Organic Pelleted Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Golden Frills Mustard Greens

Golden Frills

Mustard Green Seed

Bright green, intricately serrated leaves with spicy flavor.

MacDonald Rhubarb Crowns

MacDonald

Rhubarb Crowns

Root-rot resistant.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Lettuce Seed

Versatile mini romaine with sweet flavor.

Katrina Cucumbers

Katrina

(F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

Red Kingdom Asian Greens

AAS (All-America Selections) Winners

Red Kingdom

(F1) Asian Green Seed

Dark purple leaf with bright green stem.

Amadeus Standard Broccoli

Amadeus

(F1) Broccoli Seed

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

Rosaine Bibb Lettuce

Rosaine

Pelleted Lettuce Seed

Dark red Little Gem-type for mini heads.

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Bauer Oakleaf Lettuce

AAS (All-America Selections) Winners

Bauer

Organic Pelleted Lettuce Seed

Award-winning dark green oakleaf for full-size heads.

Ruby Red Orach Specialty Greens

Ruby Red Orach

Organic Specialty Green Seed

Colorful heat-tolerant spinach alternative.

Purple Fusion Summer Crisp Lettuce (Batavia)

Purple Fusion

Lettuce Seed

Summer performance with color.

Paxton Standard Cauliflower

Paxton

(F1) Cauliflower Seed

Resistance to club root.

Tropicana Lettuce

Tropicana

Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Pelleted Lettuce Seed

Versatile mini romaine with sweet flavor.

Sparx Romaine Lettuce (Cos)

Sparx

Lettuce Seed

Heat-tolerant romaine for long, uniform hearts with good flavor.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Lettuce Seed

Slow bolting and upright with great flavor.

Casey Butterhead Lettuce (Boston)

Casey

Pelleted Lettuce Seed

Improved butterhead for CEA summer slot.

Azirka CrunchLeaf Lettuce

Azirka

Pelleted Lettuce Seed

Extra-crunchy complement to Cristabel.

Kolibri Bibb Lettuce

Kolibri

Organic Pelleted Lettuce Seed

Gorgeous speckled mini bibb.

Red Leaf Vegetable Amaranth Specialty Greens

Red Leaf Vegetable Amaranth

Specialty Green Seed

Known as "red callaloo" in the Caribbean, comparable to spinach in taste.

Red Splendor Mustard Greens

Red Splendor

Mustard Green Seed

Dark red and green, deeply lobed leaves.

Panisse Oakleaf Lettuce

Panisse

Lettuce Seed

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

Gimlet Specialty Cucumbers

Gimlet

Organic (F1) Cucumber Seed

Lime green snacker.

Volcana Bibb Lettuce

Volcana

Pelleted Lettuce Seed

Red-to-the-heart mini.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Pelleted Lettuce Seed

Crunchy rib with an iceberg look.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Lettuce Seed

Crunchy rib with an iceberg look.

Breen Romaine Lettuce (Cos)

Breen

Lettuce Seed

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

Sale

Salvius Romaine Lettuce (Cos)

Salvius

Lettuce Seed

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