Mayo Watermelon is a storied heirloom from the farmers of Los Capomos, Sinaloa, Mexico, brought into seed preservation by Native Seeds/SEARCH. The vines produce an abundance of melons in surprising variety, some small and perfectly round while others stretch into oblong shapes, with rind colors that shift across the harvest. Beneath those variable exteriors lies consistently sweet red flesh. Hardy across zones 3 through 11, this cultivar thrives in warm soil (70-85°F for germination) and high water conditions, making it well-suited to home gardens willing to give it the moisture and heat it demands.
—
High
3-11
?in H x ?in W
—
High
Hover over chart points for details
The true character of Mayo Watermelon lies in its prolific nature and beautiful diversity. A single planting yields melons of strikingly different shapes and rind patterns, giving gardeners an almost surprising harvest as vines sprawl across the bed. The sweet red flesh and variable morphology reflect the genetic diversity preserved by the farmers who originally cultivated it in Sinaloa, making every season feel like a small act of agricultural heritage-keeping.
Mayo Watermelons are grown primarily for fresh eating, their sweet red flesh offering the classic summer refreshment. The variable sizes allow flexibility in how you harvest and use them, from small melons ideal for small households to larger ones suited for gatherings or sharing.
No timeline data available yet for this variety.
Start seeds indoors 3 to 4 weeks before your last spring frost date, using seed trays filled with warm, well-draining seed starting mix. Maintain soil temperature between 70 and 85°F using a seedling heat mat if necessary. Watermelon seeds germinate best with consistent warmth; cooler conditions will slow germination significantly. Provide bright light once seedlings emerge to prevent legginess.
Transplant seedlings outdoors 2 to 3 weeks after your last frost date, once soil has warmed to at least 60°F and all danger of frost has passed. Harden off seedlings over 7 to 10 days by gradually exposing them to outdoor conditions. Space plants 3 to 4 feet apart in rows that are 5 to 6 feet apart, allowing ample room for sprawling vines.
Direct sow seeds outdoors 2 to 3 weeks after your last spring frost date, pushing seeds 1 inch deep into warm soil. Thin seedlings once they develop their first true leaves, spacing them 3 to 4 feet apart.
Harvest Mayo Watermelons when the rind shows full color (colors vary across your harvest, so look for rich, developed hues rather than pale or green patches) and the melon feels heavy for its size. The bottom spot where the melon rests on the ground should shift from pale green to creamy yellow or tan. Tap the melon with your knuckles; a ripe watermelon produces a hollow, deep sound rather than a thin hollow ring. Cut melons from the vine with a sharp knife rather than pulling them, leaving a short stub of stem attached. Harvest in the morning when temperatures are coolest.
Enter your ZIP code to see a personalized growing calendar for this plant.
“Mayo Watermelon carries the story of Mexican agricultural knowledge within its seeds. Originally collected from Mayo farmers working in Los Capomos, Sinaloa, Mexico, this variety represents generations of selection and adaptation to that specific region's climate and soil. Native Seeds/SEARCH, the nonprofit seed conservation organization, rescued this cultivar for their Seed-Bank Collection, recognizing its value not just as food but as a living record of indigenous and traditional Mexican farming practices. The variety's prolific, variable nature reflects the survival strategies Mexican farmers developed, breeding for abundant yields and diverse fruit types that spread risk and ensured food security across seasons.”