Can You Use Red Mulch for Watermelons?

Plastic Mulch

• Horticulturists from several universities, including North Dakota State, Texas A&M and the University of Minnesota agree plastic mulch helps increase the yield of watermelon vines. Watermelons require long, hot growing seasons and often don't mature until after the first frost in cooler regions. Plastic mulch helps keep the ground warm and ensure the longevity of the vine. Black, clear or silver are recommended colors as they may help repel insects while increasing yields. According to a study done by Texas A&M red plastic mulch attracted the highest number of cucumber beetles to their watermelon test vines but still showed an increase in yield over bare ground.

Organic Mulch

• For those who prefer a mulch that builds the soil's organic matter, organic mulches are still helpful in keeping the ground warm, preventing weeds and conserving water. Organic mulches include wood chips, cover crop debris and even newspaper. According to a study done by Kentucky State University, newspaper is the best organic mulch. While yields with newspaper were less than with plastic, the environmental benefits, including soil enhancement, were significant.

Applying Mulch

• If you decide to use plastic mulch, dig a trench about 5 inches deep around your planting bed. During the hottest part of the day stretch the mulch tightly over the bed and bury the edges in the trench. Allow mulch to sit for a few days before planting to ensure warm soil. When you're ready to plant, cut a slit in the plastic for your seeds or seedlings. Organic mulches, like newspaper or wood chips, shouldn't be applied until the soil reaches 75 degrees, according to the University of Minnesota. This ensures your mulch is keeping heat in, not out. Apply a layer of newspaper covered with at least 6 inches of straw for best results.

Growing Tips

• Proper irrigation is important to a successful harvest. Watermelons need about 1 to 2 inches of water per week for proper fruit set. Too much watering may cause the fruit to split. As fruits ripen, reducing the amount of irrigation can improve flavor according the University of Minnesota. Vines that are properly irrigated and fertilized are less susceptible to disease and insects.