Imperial 45 is a heat-loving cantaloupe that earned an All-America Selections award for good reason. This open-pollinated heirloom produces large melons with a classic light golden netted skin and sweet, delicious flesh, maturing in 65 to 90 days depending on growing conditions. Hardy vines thrive across hardiness zones 2 through 13 in full sun, and the variety handles the stress of heat exceptionally well, making it reliable even during hot summers. With strong resistance to powdery mildew and five major disease threats, Imperial 45 is as dependable as it is flavorful.

Photo © True Leaf Market
48
Full Sun
Moderate
2-13
15in H x ?in W
—
High
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Imperial 45 earned its AAS recognition by combining old-world reliability with modern disease resistance. The melons grow impressively large on vigorous vines and develop that signature golden color gardeners recognize at the farmers market, but what truly sets this variety apart is its ability to handle both extreme heat and the powdery mildew that plagues many melons. You get genuine heirloom flavor, disease protection, and the kind of heat tolerance that actually shows up when summer temperatures spike.
Imperial 45 melons are eaten fresh, typically sliced and served chilled as a summer dessert or breakfast fruit. The sweet flesh also works beautifully in fruit salads, smoothies, and as a palate cleanser. Some gardeners preserve the melons by making melon jam or freezing the flesh for winter use, though the variety truly shines when eaten within days of harvest at peak ripeness.
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Transplant Imperial 45 seedlings outdoors after all danger of frost has passed and soil temperatures reach at least 65 to 70 degrees Fahrenheit. Harden off seedlings gradually over 7 to 10 days before planting to reduce transplant shock. Space plants 48 inches apart in rows set 72 inches apart, planting at the same depth they grew in containers.
Direct sow Imperial 45 seeds outdoors once soil temperatures reach 65 to 70 degrees Fahrenheit and frost danger has completely passed. Plant seeds 1 inch deep in prepared soil, spacing them 3 to 4 inches apart initially, then thin seedlings to final spacing of 48 inches within rows.
Harvest Imperial 45 melons when they reach mature size and the skin turns a full light golden color with a pronounced netted pattern. Press gently on the blossom end; ripe melons yield slightly to pressure and smell sweet and fragrant. Listen for a hollow sound when you tap the melon with your knuckles, another sign of ripeness. Pick melons in the morning when temperatures are cool, using a sharp knife to cut the stem rather than pulling. With a maturity window of 65 to 90 days from planting, most melons ripen in waves throughout the season.
Imperial 45 vines benefit from selective pruning to improve air circulation and redirect energy toward fruit production. Pinch back the main vine after it reaches 4 to 5 feet in length to encourage lateral branching, which typically produces more flowering side shoots. Remove any obviously diseased or damaged foliage promptly to prevent disease spread, and thin crowded leaves around developing fruits to improve sun exposure and air flow, which reduces powdery mildew pressure.
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“Imperial 45, also known as Hale's Best No. 45 and Imperial 45 Shipper, is an open-pollinated heirloom that achieved All-America Selections recognition for its combination of flavor and field performance. Its lineage traces to the classic cantaloupe breeding programs that shaped American melon production, and it has been saved and passed down by gardeners for generations. The variety was developed to deliver both the eating quality that home gardeners demand and the shipping durability that commercial growers require, making it one of the few melons equally at home in a backyard patch or a farmers market stand.”