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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Panisse Oakleaf Lettuce

Panisse

Lettuce Seed

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

Red Giant Mustard Greens

Red Giant

Organic Mustard Green Seed

Very slow-bolting broadleaf mustard.

Volcana Bibb Lettuce

Volcana

Pelleted Lettuce Seed

Red-to-the-heart mini.

Red Splendor Mustard Greens

Red Splendor

Mustard Green Seed

Dark red and green, deeply lobed leaves.

Green River Asian Greens

Green River

(F1) Asian Green Seed

Upright, refined komatsuna for bunching and baby leaf.

Qwerty Seedless and Thin-skinned Cucumbers

Qwerty

(F1) Cucumber Seed

Premium cocktail cucumber.

Bluerock Romaine Lettuce (Cos)

Bluerock

Organic Lettuce Seed

Classic romaine with modern disease resistance.

Sparx Romaine Lettuce (Cos)

Sparx

Lettuce Seed

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

Gatsbi Bibb Lettuce

Gatsbi

Lettuce Seed

High-performance gem type.

Volcana Bibb Lettuce

Volcana

Lettuce Seed

Red-to-the-heart mini.

Gimlet Specialty Cucumbers

Gimlet

(F1) Cucumber Seed

Lime green snacker.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Pelleted Lettuce Seed

Versatile mini romaine with sweet flavor.

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.

Rubygo One-Cut Lettuce

Rubygo

Pelleted Lettuce Seed

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

Twister Standard Cauliflower

Twister

(F1) Cauliflower Seed

Superior wrap and adaptability.

Xalbadora Romaine Lettuce (Cos)

Xalbadora

Organic Lettuce Seed

Versatile mini romaine with sweet flavor.

Salvius Romaine Lettuce (Cos)

Salvius

Lettuce Seed

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

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Lettuce Seed

Slow bolting and upright with great flavor.

Tropicana Lettuce

Tropicana

Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Breen Romaine Lettuce (Cos)

Breen

Pelleted Lettuce Seed

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

Paxton Standard Cauliflower

Paxton

(F1) Cauliflower Seed

Resistance to club root.

Katrina Cucumbers

Katrina

(F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

Amadeus Standard Broccoli

Amadeus

(F1) Broccoli Seed

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

Riptide Romaine Lettuce (Cos)

Riptide

Organic Pelleted Lettuce Seed

Crunchy rib with an iceberg look.

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.

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.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Pelleted 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.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

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.

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

New

MacDonald Rhubarb Crowns

MacDonald

Rhubarb Crowns

Root-rot resistant.

Out Of Stock