Can You Plant Watermelon & Cantaloupe in the Same Bed?

Miss Chen
Both watermelons (Citrullus lanatus) and cantaloupes (Cucumis melo) are members of the cucumber family, Cucurbitaceae. These annual vines with long, sprawling stems take up a large area in a garden and need lots of sunshine and warm temperatures to produce well. Honeybees pollinate the plants' flowers, but the pollen from watermelon and cantaloupes do not create hybrid fruits.

The foremost concern in planting both cantaloupe and watermelons in the same garden bed is space. The vines of both melons spread far and will grow wherever they can to access sunlight. Plants too close together cause unnecessary competition for light, soil moisture and nutrients. Dense vegetation may also lead to humid conditions on the soil surface and increase fungal diseases. If space is an issue, modern varieties include some bush-types which mature with short vines and may be more suitable to the dimensions of your garden.

Closely related vegetable vines like pumpkins, gourds and squashes cross-pollinate each other's flowers and can yield awkward, inconsistent hybrid fruits. Watermelons and cantaloupes do not cross-pollinate each other. However, according to Virginia Cooperative Extension, you should expect different varieties of cantaloupes, honeydews and muskmelons to cross-pollinate each other within close range in the garden. Depending on genetics, this may lead to fruits with variable fruit qualities that aren't always desirable.

Disease and Pest Concerns
Since watermelons and muskmelons are susceptible to many of the same pests and diseases, growing both crops in a garden bed may be problematic. For example, if the watermelon is attacked by stem borers and not treated, the pest can quickly spread and harm nearby cantaloupe vines. Potential disease problems exist, including threats from alternaria blight, bacterial wilt, fusarium wilt, leaf spot and powdery and downy mildews. Cucumber beetles, squash vine borers, pickleworms and squash bugs also attack both plants. Cucumber beetles tend to spread the bacterial wilt disease around the garden.

Growing Tips
Watermelons and cantaloupes can grow and produce well in the same spacious garden bed. If the gardener remains conscientious about monitoring for weeds, disease and insect pests, any potential major cultural problems can be avoided or treated. Encourage a chemical-free garden so honeybees and bumblebees pollinate the melon flowers. Also consider placing developing melon fruits on a piece of scrap plywood to keep them from resting directly on the moist garden soil. This prevents rot and can assist in limiting access of insects to the ripening fruits.
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