Featured Heat Tolerant
One of our heat tolerant lettuce varieties growing in the field.
Heat Tolerant
In our trials, we test and select varieties that can endure heat successfully. This includes heat-tolerant versions of cool-weather crops; for example, heat-tolerant lettuce, spinach, broccoli, and kale varieties that can help keep you in greens throughout the hot summer months. We also seek out highly heat-tolerant versions of warm-weather crops, such as heat-tolerant tomatoes with the ability to set fruit even during the summer heat of southern growing zones. Choose from a large assortment of heat-tolerant vegetable seed varieties to fill your seasonal planting slots. Not sure of what to choose for your growing zone? Our customer service team is ready to help.
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AAS (All-America Selections) Winners
Green Wave Mustard Greens
Our spiciest green mustard.
Our spiciest green mustard.
21 baby; 45 full size
Uniform red leaf with heat tolerance and heavy heads of frilly leaves.
Uniform red leaf with heat tolerance and heavy heads of frilly leaves.
55 Days
Standard heat-tolerant green leaf with disease resistance.
Standard heat-tolerant green leaf with disease resistance.
52 Days
Bright green leaves form dense, closed heads.
Bright green leaves form dense, closed heads.
48 Days
Exceptionally sweet, early cauliflower.
Exceptionally sweet, early cauliflower.
42 Days
Heat-tolerant romaine for long, uniform hearts with good flavor.
Heat-tolerant romaine for long, uniform hearts with good flavor.
58 Days
A red Summer Crisp with good flavor.
A red Summer Crisp with good flavor.
48 Days
Darkest red leaves with long harvest window and good flavor.
Darkest red leaves with long harvest window and good flavor.
48 Days
Bolt tolerant, widely adaptable with open habit suited for heads.
Bolt tolerant, widely adaptable with open habit suited for heads.
58 Days
Large, heat-resistant bunching onions.
Large, heat-resistant bunching onions.
65 Days
Johnny's Exclusive
Carlton Asian Greens
Very dark green komatsuna with good heat and cold tolerance.
Very dark green komatsuna with good heat and cold tolerance.
21 baby; 35 full size
Most adaptable butterhead with excellent flavor and texture.
Most adaptable butterhead with excellent flavor and texture.
47 Days
Johnny's Exclusive
Red Splendor Mustard Greens
Dark red and green, deeply lobed leaves.
Dark red and green, deeply lobed leaves.
21 baby; 45 full size
Very slow bolting, broadleaf mustard.
Very slow bolting, broadleaf mustard.
21 baby, 45 full size
Heat tolerant, full-size romaine.
Heat tolerant, full-size romaine.
57 Days
Heat loving salad and stir-fry green with mild Swiss chard flavor.
Heat loving salad and stir-fry green with mild Swiss chard flavor.
50 baby; 85 full size
Known as "Red Callaloo" in the Caribbean, comparable to spinach in taste.
Known as "Red Callaloo" in the Caribbean, comparable to spinach in taste.
50 Days
Bolt tolerant, widely adaptable with open habit suited for heads.
Bolt tolerant, widely adaptable with open habit suited for heads.
58 Days
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