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

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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 Giant Mustard Greens

Red Giant

Organic Mustard Green Seed

Very slow-bolting broadleaf mustard.

Lalique Summer Crisp Lettuce (Batavia)

Lalique

Pelleted Lettuce Seed

Crunchy sandwich-sized leaves with year-round performance.

Gimlet Specialty Cucumbers

Gimlet

(F1) Cucumber Seed

Lime green snacker.

Green River Asian Greens

Green River

(F1) Asian Green Seed

Upright, refined komatsuna for bunching and baby leaf.

Red Splendor Mustard Greens

Red Splendor

Mustard Green Seed

Dark red and green, deeply lobed leaves.

Sparx Romaine Lettuce (Cos)

Sparx

Lettuce Seed

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

Salvius Romaine Lettuce (Cos)

Salvius

Lettuce Seed

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

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

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

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Casey Butterhead Lettuce (Boston)

Casey

Pelleted Lettuce Seed

Improved butterhead for CEA summer slot.

Twister Standard Cauliflower

Twister

(F1) Cauliflower Seed

Superior wrap and adaptability.

Qwerty Seedless and Thin-skinned Cucumbers

Qwerty

(F1) Cucumber Seed

Premium cocktail cucumber.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Pelleted Lettuce Seed

Versatile mini romaine with sweet flavor.

Bluerock Romaine Lettuce (Cos)

Bluerock

Organic Lettuce Seed

Classic romaine with modern disease resistance.

Golden Frills Mustard Greens

Golden Frills

Mustard Green Seed

Bright green, intricately serrated leaves with spicy flavor.

Red Kingdom Asian Greens

AAS (All-America Selections) Winners

Red Kingdom

(F1) Asian Green Seed

Dark purple leaf with bright green stem.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Lettuce Seed

Versatile mini romaine with sweet flavor.

Tropicana Lettuce

Tropicana

Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Lettuce Seed

Slow bolting and upright with great flavor.

Paxton Standard Cauliflower

Paxton

(F1) Cauliflower Seed

Resistance to club root.

Katrina Cucumbers

Katrina

(F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

Breen Romaine Lettuce (Cos)

Breen

Pelleted Lettuce Seed

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

Amadeus Standard Broccoli

Amadeus

(F1) Broccoli Seed

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

Salanova® Hydroponic Green Butter Salanova® Lettuce

Salanova® Hydroponic Green Butter

Pelleted Lettuce Seed

Fast-growing butter type.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Lettuce Seed

Crunchy rib with an iceberg look.

Riptide Romaine Lettuce (Cos)

Riptide

Organic Pelleted Lettuce Seed

Crunchy rib with an iceberg look.

Green Wave Mustard Greens

AAS (All-America Selections) Winners

Green Wave

Organic Mustard Green Seed

Our spiciest green mustard.

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.

Picolino Seedless and Thin-skinned Cucumbers

Picolino

Organic (F1) Cucumber Seed

High-quality organic snacking cucumber.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Pelleted Lettuce Seed

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

Red Cloud Asian Greens

Red Cloud

(F1) Asian Green Seed

Rich burgundy hybrid tatsoi for bunching or baby leaf.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Lettuce Seed

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

New

Evie-2 Strawberry Bare-Root Plants

Evie-2

Strawberry Plants

High-yielding day-neutral (everbearing) type.

Out Of Stock

New

San Andreas Strawberry Bare-Root Plants

San Andreas

Strawberry Plants

Productive day-neutral for Southern growers.

Out Of Stock