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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Gimlet Specialty Cucumbers

Gimlet

(F1) Cucumber Seed

Lime green snacker.

Tendita Romaine Lettuce (Cos)

Tendita

Lettuce Seed

Crunchy, snackable, stackable mini cosberg.

Red Giant Mustard Greens

Red Giant

Organic Mustard Green Seed

Very slow-bolting broadleaf mustard.

Golden Frills Mustard Greens

Golden Frills

Mustard Green Seed

Bright green, intricately serrated leaves with spicy flavor.

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.

Breen Romaine Lettuce (Cos)

Breen

Pelleted Lettuce Seed

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

Red Splendor Mustard Greens

Red Splendor

Mustard Green Seed

Dark red and green, deeply lobed leaves.

Cristabel CrunchLeaf Lettuce

Cristabel

Pelleted Lettuce Seed

Extra-crunchy complement to Azirka.

Sparx Romaine Lettuce (Cos)

Sparx

Lettuce Seed

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

New Red Fire Leaf Lettuce

New Red Fire

Organic Lettuce Seed

Uniform red leaf with heat tolerance and heavy heads of frilly leaves.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Lettuce Seed

Slow bolting and upright with great flavor.

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 Lettuce Seed

Classic romaine with modern disease resistance.

Kolibri Bibb Lettuce

Kolibri

Organic Pelleted Lettuce Seed

Gorgeous speckled mini bibb.

Lalique Summer Crisp Lettuce (Batavia)

Lalique

Pelleted Lettuce Seed

Crunchy sandwich-sized leaves with year-round performance.

Tendita Romaine Lettuce (Cos)

Tendita

Pelleted Lettuce Seed

Crunchy, snackable, stackable mini cosberg.

Reno Summer Crisp Lettuce (Batavia)

Reno

Lettuce Seed

Exceptional heat tolerance.

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Bopak Pac Choi (Bok Choy)

AAS (All-America Selections) Winners

Bopak

Organic (F1) Green Seed

Organic white-stemmed pac choi.

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.

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.

Paxton Standard Cauliflower

Paxton

(F1) Cauliflower Seed

Resistance to club root.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Lettuce Seed

Crunchy rib with an iceberg look.

Sale

Adam Gherkin Pickling Cucumbers

Adam Gherkin

Organic (F1) Cucumber Seed

High-quality European pickler with high yields.

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

Salvius Romaine Lettuce (Cos)

Salvius

Lettuce Seed

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

Sale

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

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

Sale

Twister Standard Cauliflower

Twister

(F1) Cauliflower Seed

Superior wrap and adaptability.

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.