Identifying Mystery Squash: Spaghetti Squash vs. Watermelon

Key Differences at Immature Stage

Feature	Spaghetti Squash	Watermelon
Shape	Oblong, watermelon-like	Round to oblong
Skin (young)	Pale green, smooth	Green, often striped
Stem attachment	Angled, 5-sided	Round, curly tendril
Color change	Turns bright yellow	Stays green, ground spot yellows
Flesh	Stringy, pale yellow	Crisp, pink/red

If it turns yellow → spaghetti squash. Harvest when fully yellow.
If it stays green and expands → watermelon. Harvest at tendril dry + dull thump.
Volunteer plants often revert to wild types—flavor/texture unpredictable.

Either way, it's a bonus crop. Cook spaghetti squash like pasta; eat watermelon fresh. Note location for future intentional planting.

Growing Vegetables: Volunteer Summer Squash in California: Cucuzza, Chayote, or Goldball?; Mystery Squash: Is It a Spaghetti Squash-Zucchini Hybrid?; Dealing with Unripe Spaghetti Squash in Fall; Identifying and Using a Mystery Squash Vine in the Garden; Identifying a Volunteer Squash: Cross-Pollination and Harvest Tips; Identifying a Volunteer Squash or Gourd: Safe to Eat?; Spaghetti Squash Flower Drop: Early Male Flowers and Pollination; How to Store Spaghetti Squash for Months; When to Harvest Spaghetti Squash and Cantaloupe for Peak Flavor; How to Grow Spaghetti Squash: In Gardens and Containers

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