How much light should tomato seedlings get? If you give them too little, they will become tall, skinny, unhealthy plants, a condition called leggy. If you give them too much the leaves will be damaged. How much is the best amount?
The new science of growing tomato seedlings will surprise you.

Key Takeaways
- Tomato seedlings grow best with a PPFD of 250 to 300.
- A DLI of 10 to 13 works best.
- All plant seedlings need 8 hours of darkness.
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