Heat Tolerant Varieties | Johnny's Selected Seeds

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Heat Tolerant

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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Blueray Blueberry

Blueray

Blueberry Plants

Versatile grower favorite for fresh eating.

Salanova® Green Butter Salanova® Lettuce

Salanova® Green Butter

Pelleted Lettuce Seed

Dense rosette heads with buttery flavor and attractive, supple leaves.

Rover Round Radishes

Rover

(F1) Radish Seed

Extra-early and refined.

Salanova® Red Butter Salanova® Lettuce

Salanova® Red Butter

Pelleted Lettuce Seed

Dense rosette heads with buttery flavor and attractive, supple leaves.

Truchas Romaine Lettuce (Cos)

Truchas

Organic Lettuce Seed

Compact, filled-out mini heads that are dark red even in the North.

Salanova® Green Oakleaf Salanova® Lettuce

Salanova® Green Oakleaf

Pelleted Lettuce Seed

Condensed saladbowl-type oakleaf for whole heads or salad mixes.

Salanova® Hydroponic Red Butter Salanova® Lettuce

Salanova® Hydroponic Red Butter

Pelleted Lettuce Seed

Vigorous, slow-bolting red butter type.

Salanova® Red Oakleaf Salanova® Lettuce

Salanova® Red Oakleaf

Pelleted Lettuce Seed

Condensed saladbowl-type oakleaf for whole heads or salad mixes.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Pelleted Lettuce Seed

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

Salanova® Green Sweet Crisp Salanova® Lettuce

Salanova® Green Sweet Crisp

Pelleted Lettuce Seed

Romaine-like sweet flavor with iceberg-like crisp, crunchy texture.

Salanova® Hydroponic Green Butter Salanova® Lettuce

Salanova® Hydroponic Green Butter

Pelleted Lettuce Seed

Fast-growing butter type.

Chalupa Romaine Lettuce (Cos)

Chalupa

Organic Pelleted Lettuce Seed

Unique, sweet romaine with excellent bolt tolerance.

Sora Round Radishes

Sora

Organic Radish Seed

Heat-tolerant organic variety that produces high-quality roots.

Salanova® Hydroponic Green Oakleaf Salanova® Lettuce

Salanova® Hydroponic Green Oakleaf

Pelleted Lettuce Seed

Attractive leaf shape on compact heads.

Salanova® Hydroponic Red Oakleaf Salanova® Lettuce

Salanova® Hydroponic Red Oakleaf

Pelleted Lettuce Seed

Uniform, upright leaves and good weight.

Muir Summer Crisp Lettuce (Batavia)

Muir

Organic Pelleted Lettuce Seed

The most heat tolerant lettuce.

Green Magic Standard Broccoli

Green Magic

(F1) Broccoli Seed

Excellent heat tolerance and smooth, well-domed, very attractive heads.

Salanova® Hydroponic Green Sweet Crisp Salanova® Lettuce

Salanova® Hydroponic Green Sweet Crisp

Pelleted Lettuce Seed

High-yielding, crispy green leaf with excellent shelf-life.

Astro Arugula (Roquette)

Astro

Salad Arugula Seed

Early, heat-tolerant standard variety.

Sunland Romaine Lettuce (Cos)

Sunland

Pelleted Lettuce Seed

Heat-tolerant romaine for heads and hearts.

Kolibri Bibb Lettuce

Kolibri

Organic Lettuce Seed

Gorgeous speckled mini bibb.

Rosaine Bibb Lettuce

Rosaine

Lettuce Seed

Dark red Little Gem-type for mini heads.

Tropicana Lettuce

Tropicana

Pelleted Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Katrina Cucumbers

Katrina

(F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

Breen Romaine Lettuce (Cos)

Breen

Organic Pelleted Lettuce Seed

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

Sparx Romaine Lettuce (Cos)

Sparx

Pelleted Lettuce Seed

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

Gladius Romaine Lettuce (Cos)

Gladius

Pelleted Lettuce Seed

High-performance romaine for hydroponics.

Salanova® Hydroponic Red Batavia Salanova® Lettuce

Salanova® Hydroponic Red Batavia

Pelleted Lettuce Seed

Unique leaf with intense color.

Estiva Slicing Tomatoes

Estiva

(F1) Tomato Seed

Delicious slicer with impressive heat tolerance.

Skyphos Butterhead Lettuce (Boston)

Skyphos

Pelleted Lettuce Seed

Most adaptable butterhead with excellent flavor and texture.

Adriana Butterhead Lettuce (Boston)

Adriana

Pelleted Lettuce Seed

Heat tolerant dark green butterhead with broad disease resistance.

Bauer Oakleaf Lettuce

AAS (All-America Selections) Winners

Bauer

Organic Pelleted Lettuce Seed

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

Red Cloud Asian Greens

Red Cloud

(F1) Asian Green Seed

Rich burgundy hybrid tatsoi for bunching or baby leaf.

Astro Arugula (Roquette)

Astro

Organic Salad Arugula Seed

Early, heat-tolerant standard variety.

Truchas Romaine Lettuce (Cos)

Truchas

Organic Pelleted Lettuce Seed

Compact, filled-out mini heads that are dark red even in the North.

Salanova® Hydroponic Red Sweet Crisp Salanova® Lettuce

Salanova® Hydroponic Red Sweet Crisp

Pelleted Lettuce Seed

Slow bolting and great shelf-life.

Imperial Standard Broccoli

Imperial

(F1) Broccoli Seed

Excellent heat tolerance.

Cherokee Summer Crisp Lettuce (Batavia)

Cherokee

Pelleted Lettuce Seed

Darkest red leaves with long harvest window and good flavor.

Rhone One-Cut Lettuce

Rhone

Organic Pelleted Lettuce Seed

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

Salanova® Green Batavia Salanova® Lettuce

Salanova® Green Batavia

Pelleted Lettuce Seed

Tasty, versatile Batavia leaf type.

Chalupa Romaine Lettuce (Cos)

Chalupa

Organic Lettuce Seed

Unique, sweet romaine with excellent bolt tolerance.

Miz America Mustard Greens

Miz America

(F1) Mustard Green Seed

Exceptionally dark red, deeply lobed leaves.

Salanova® Red Gem Salanova® Lettuce

Salanova® Red Gem

Pelleted Lettuce Seed

Gorgeous Little Gem-type Salanova.

Happy Rich Mini Broccoli

Happy Rich

(F1) Broccoli Seed

Vigorous mini broccoli for successful summer crops and sweeter flavor.

Southern Giant Curled Mustard Greens

Southern Giant Curled

Mustard Green Seed

Our recommended sub for Green Wave.

Clementine Standard Cauliflower

Clementine

(F1) Cauliflower Seed

Vibrant orange.

Jolene Beefsteak Tomatoes

Jolene

(F1) Tomato Seed

Excels in the Southern U.S.

Salanova® Red Tango Salanova® Lettuce

Salanova® Red Tango

Pelleted Lettuce Seed

Premier one-cut Tango type.

Black Summer Pac Choi (Bok Choy)

Black Summer

(F1) Green Seed

Beautiful dark green pac choi, best at full size, suitable for minis.

Bopak Pac Choi (Bok Choy)

AAS (All-America Selections) Winners

Bopak

Organic (F1) Green Seed

Organic white-stemmed pac choi.

Crunchy King Round Radishes

Crunchy King

(F1) Radish Seed

Even maturity and a long harvest window.

Red Giant Mustard Greens

Red Giant

Organic Mustard Green Seed

Very slow-bolting broadleaf mustard.

Gershwin Pickling Cucumbers

Gershwin

(F1) Cucumber Seed

Parthenocarpic field pickler.

Bauer Oakleaf Lettuce

AAS (All-America Selections) Winners

Bauer

Organic Lettuce Seed

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

Tropicana Lettuce

Tropicana

Organic Lettuce Seed

Standard heat-tolerant green leaf with disease resistance.

Monte Carlo Romaine Lettuce (Cos)

Monte Carlo

Lettuce Seed

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

Starfighter Lettuce

Starfighter

Pelleted Lettuce Seed

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

Romance Main Crop Carrots

Romance

Pelleted (F1) Carrot Seed

Impressive flavor for a summer-harvested carrot.

Fusion Summer Crisp Lettuce (Batavia)

Fusion

Pelleted Lettuce Seed

Slow bolting and upright with great flavor.

Asian Delight Pac Choi (Bok Choy)

AAS (All-America Selections) Winners

Asian Delight

(F1) Green Seed

Slow-bolting white-stem pac choi for dense, fully formed mini heads.

Panisse Oakleaf Lettuce

Panisse

Pelleted Lettuce Seed

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

Donato Round Radishes

Donato

(F1) Radish Seed

Early, resistant, and reliable.

Katrina Seedless and Thin-skinned Cucumbers

Katrina

Organic (F1) Cucumber Seed

Tasty snacking cucumber with good heat tolerance.

White Spear Bunching Onions

White Spear

Onion Seed

Large, heat-resistant bunching onions.

Magenta Summer Crisp Lettuce (Batavia)

Magenta

Pelleted Lettuce Seed

A red Summer Crisp with good flavor.

Red Cross Butterhead Lettuce (Boston)

Red Cross

Organic Pelleted Lettuce Seed

Large and fancy, heat tolerant red butterhead for stunning display.

Green River Asian Greens

Green River

(F1) Asian Green Seed

Upright, refined komatsuna for bunching and baby leaf.