Citrullus lanatus Seeds | Crimson Sweet Watermelon
LATIN NAME: Citrullus lanatus
COMMON NAME: Crimson Sweet Watermelon
Plant Profile
The stems are angled in section and bear simple, unbranched tendrils that coil around any support they meet. The leaves are deeply palmately cut into three to five lobes and feel like sandpaper from the minute stiff hairs on both faces. A useful field mark separates watermelon from its close gourd cousins: the tendril is single, not branched, and the leaf sinus between the side lobes stays open rather than closing toward the midrib the way a squash leaf does.
The botanical name lanatus means “woolly,” a direct nod to the grey fuzz on the young stems and the backs of the leaves. The fruit is a pepo, the berry type of the gourd family with a hard rind and a hollow centre where the flat seeds sit in a juicy placental tissue. Crimson Sweet fruits commonly weigh seven to eleven kilograms and were selected for tolerance to the fungal diseases that ruin lesser melons, which is why the variety still appears in warm-season gardens decades after its release.
The obvious use is the chilled wedge, but the whole fruit earns its keep. The firm rind that most cooks compost is the part prized in pickling traditions from the American South to eastern Europe, and the seeds are a snack in their own right.
Cut a ripe fruit and the sugar reads around eleven to twelve on the Brix scale, sweet enough to need no addition. Cold-pressed juice blends well with lime and a leaf of mint, and the red flesh freezes into granita without losing its colour because the lycopene is stable to light and heat. Scoop the flesh into cubes and it holds shape in fruit salads better than softer melons do.
Science & Biotechnology
The flesh is more than sugar water. Watermelon is the richest everyday food source of the amino acid L-citrulline, and the red colour is built from the same carotenoid that paints a tomato. These compounds are what give the fruit its quiet value beyond refreshment on a hot afternoon.
L-citrulline concentrates in the white rind and the pale tissue just under the coloured flesh, not only in the red centre, which is why traditional cooks who use the whole fruit are onto something. The body converts citrulline to arginine, and the level in ripe watermelon flesh is higher than in most other common fruits. This is a genuine, measured trait of the species, not a marketing claim.
The red hue comes from lycopene, and the flesh also carries useful vitamin C plus a little beta-carotene. Because lycopene is fat-soluble, a slice eaten alongside a few nuts or a dab of yogurt gives the body a better shot at absorbing it. The seeds, often discarded, hold protein and oil and are eaten roasted across many cultures.
Uses & Benefits
Trim the green skin and the thin red layer from the rind, cube the white part, and simmer it in vinegar with sugar and whole spice for a sweet-sour preserve that keeps for months. The seeds, rinsed free of pulp, dry and then roast in a hot oven until they pop and turn golden; salt them while warm. In China and Mexico the toasted seed is a street snack sold by the handful.
Growing from Seed
A single Crimson Sweet fruit can be more than nine-tenths water, yet the detail that gardeners remember is the stripe. This open-pollinated heirloom carries pale-green skin painted with bands of deep green, and under that rind the flesh is a dense, sweet red that anchors the variety’s reputation. The plant is a rough, hairy annual vine in the gourd family that runs along the ground on long stems, sets both male and female flowers on the same plant, and anchors with a shallow, branching root.
Watermelon will not tolerate cold soil, so the work begins only after the bed has warmed. Start seed in pots in a bright, heated space, or sow straight into a prepared hill once the ground holds warmth.
Move pot-grown seedlings into the garden when they carry three true leaves and stand roughly ten centimetres tall, handling them by the leaves so the stem stays unharmed. Set two or three plants per hill on a low mound of loosened, composted ground so the roots drain. Cold soil at this stage stalls the plant and invites rot at the crown, so wait for steady warmth.
Give each hill about one and a half metres of clear ground in every direction so the running vines do not smother one another and so air moves across the leaves to deter mildew. A mulch of straw keeps the fruit clean and the soil even. Water deeply at the base and ease off as the fruits size, since a dry spell near ripening concentrates the sugar in the flesh.
Our Take
Crimson Sweet rewards patience more than effort, and the striped rind is the easiest field mark you will ever learn. If you enjoy this vine, try the Muncher Cucumber seed Cucumis sativus for a climbing crop from the same family, or plant the Cucurbita Pepo seed SUMMER SQUASH and the Pumpkin Seed Big Max to fill the warm bed with gourds of every shape.
Related Reading
Gardeners who grow Crimson Sweet Watermelon often pair it with these related subjects: