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

159 Products

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Tropicana Lettuce

Tropicana

Organic Pelleted Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Pelleted Lettuce Seed

A red Summer Crisp with good flavor.

Gatsbi Bibb Lettuce

Gatsbi

Lettuce Seed

High-performance gem type.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Lettuce Seed

Slow bolting and upright with great flavor.

Bauer Oakleaf Lettuce

AAS (All-America Selections) Winners

Bauer

Organic Pelleted Lettuce Seed

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

Reno Summer Crisp Lettuce (Batavia)

Reno

Lettuce Seed

Exceptional heat tolerance.

Lalique Summer Crisp Lettuce (Batavia)

Lalique

Pelleted Lettuce Seed

Crunchy sandwich-sized leaves with year-round performance.

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.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Pelleted Lettuce Seed

Versatile mini romaine with sweet flavor.

Tendita Romaine Lettuce (Cos)

Tendita

Pelleted Lettuce Seed

Crunchy, snackable, stackable mini cosberg.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Lettuce Seed

A red Summer Crisp with good flavor.

Red Kingdom Asian Greens

AAS (All-America Selections) Winners

Red Kingdom

(F1) Asian Green Seed

Dark purple leaf with bright green stem.

Purple Fusion Summer Crisp Lettuce (Batavia)

Purple Fusion

Lettuce Seed

Summer performance with color.

Tropicana Lettuce

Tropicana

Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Sparx Romaine Lettuce (Cos)

Sparx

Lettuce Seed

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

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Lettuce Seed

Versatile mini romaine with sweet flavor.

Bluerock Romaine Lettuce (Cos)

Bluerock

Organic Lettuce Seed

Classic romaine with modern disease resistance.

Red Splendor Mustard Greens

Red Splendor

Mustard Green Seed

Dark red and green, deeply lobed leaves.

Azirka CrunchLeaf Lettuce

Azirka

Pelleted Lettuce Seed

Extra-crunchy complement to Cristabel.

Kolibri Bibb Lettuce

Kolibri

Organic Pelleted Lettuce Seed

Gorgeous speckled mini bibb.

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Paxton Standard Cauliflower

Paxton

(F1) Cauliflower Seed

Resistance to club root.

Amadeus Standard Broccoli

Amadeus

(F1) Broccoli Seed

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

Volcana Bibb Lettuce

Volcana

Pelleted Lettuce Seed

Red-to-the-heart mini.

Breen Romaine Lettuce (Cos)

Breen

Lettuce Seed

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

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.

Sale

Salvius Romaine Lettuce (Cos)

Salvius

Lettuce Seed

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

Sale

Starfighter Lettuce

Starfighter

Lettuce Seed

Uniform, disease-resistant green leaf with excellent heat tolerance.

Sale

Carlton Asian Greens

Carlton

(F1) Asian Green Seed

Very dark green komatsuna with good heat and cold tolerance.

Sale

Twister Standard Cauliflower

Twister

(F1) Cauliflower Seed

Superior wrap and adaptability.

Sale

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

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

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Pelleted Lettuce Seed

Dark green, compact romaine for an all-season mid-size.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Lettuce Seed

Dark green, compact romaine for an all-season mid-size.

Picolino Seedless and Thin-skinned Cucumbers

Picolino

Organic (F1) Cucumber Seed

High-quality organic snacking cucumber.

Red Cloud Asian Greens

Red Cloud

(F1) Asian Green Seed

Rich burgundy hybrid tatsoi for bunching or baby leaf.