This Is Exactly When To Add Spinach To Your Slow Cooker To Avoid A Mushy Mess - Tasting Table
Briefly

Spinach, a nutrient-dense leafy green, is best added to slow cooker dishes during the final 30 minutes to preserve its texture and vibrant color.
Due to its high water content, spinach releases moisture while cooking, making it crucial to limit liquid in slow cooker dishes to avoid a mushy outcome.
To achieve optimal results, adding spinach later in the cooking process ensures that the dish maintains both its appealing visual and textural qualities.
Cooking spinach for too long can transform it from a nutritious ingredient into a dark, unappetizing mush, which can be avoided with timing.
Read at Tasting Table
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