Short answer: Yes, spinach is generally allowed during Paryushan.

Details:

• The main restriction in Paryushan is usually on root vegetables (like potatoes, onions, garlic) and on certain kinds of grains or foods during stricter fasts. Spinach is a leafy green and is not a root vegetable, so it is typically permitted.
• There are differences between Digambar and Shwetambar practices, and individual vrata (fast) rules can vary by guru or local tradition. Some Jains may choose to be more strict and limit greens during certain days or during very austere upvaas, while others are more lenient.
• If you are observing a particular vrata with specific rules (for example a strict ekantik or a specific upvaas day), confirm with your Jain guru or community guidance about greens like spinach for that period.

If you’d like, I can help you check the exact rules for your tradition or provide a simple summary of common Paryushan fasting guidelines.