To grow healthy watermelons, mix a rich, moist, and well-draining soil using specific amendments before planting.
Here's how to prepare the soil:
- Amend the Soil: Mix Scotts Osmocote Compost Premium Soil Improver and Scotts Osmocote Plus Organics Tomato, Vegetable & Herb Plant Food & Soil Improver into the top 15-20cm (6-8 inches) of soil.
Why this mix works:
- Compost: The compost improves the soil structure, drainage, and water retention, while adding essential nutrients.
- Plant Food & Soil Improver: The Scotts Osmocote Plus Organics specifically formulated for tomatoes, vegetables, and herbs provides a balanced blend of nutrients that supports vigorous growth and fruit production for watermelons.
Alternative Considerations for Soil Mixing:
If you don't have access to the specific products mentioned above, consider these general guidelines for creating a suitable watermelon soil mix:
- Well-Draining Base: Watermelons need soil that drains well to prevent root rot. Sandy loam is ideal. If your soil is heavy clay, amend it generously with organic matter to improve drainage.
- Organic Matter: Incorporate plenty of compost, well-rotted manure, or other organic materials. Aim for at least 25-50% organic matter by volume. This improves soil fertility, water retention, and aeration.
- Nutrient Boost: Watermelons are heavy feeders. In addition to compost, you can add a slow-release fertilizer formulated for vegetables, following the manufacturer's instructions.
- pH Level: Watermelons prefer a slightly acidic soil pH, ideally between 6.0 and 6.8. You can test your soil pH with a soil test kit and amend as needed. Lime can raise the pH, while sulfur can lower it.
Example Soil Mix (if you are creating your own from scratch):
- 50% Sandy Loam Soil
- 25% Compost
- 25% Aged Manure
- Slow-release vegetable fertilizer (according to package directions)
Summary:
The key to successfully mixing soil for watermelons is to provide a rich, well-draining environment with plenty of organic matter and the right nutrients. Using the suggested Scotts products or creating a custom mix with similar properties will set your watermelon plants up for success.
