Is this to strong to use on sprouts and seedlings?

You can't use too much. Only thing it will hurt is your wallet. That said you only need a bit to establish a colony on the root system. I would start using as soon as you see the tap root

Does this product have an expiration date? I am aware that this product is granular, but is it water soluble to use as a root drench for seedlings?

There are way better products for cheaper. With a better assortment of species. Look up "Endo" varieties. As a starting point. 70$ for a square yard! Huge difference. I feel this product is over priced. Dramatically.

ASIN	B00A8PG6RI
Best Sellers Rank	#790,826 in Home & Kitchen ( See Top 100 in Home & Kitchen ) #1,695 in Bathroom Accessory Sets
Brand	Plant Success
Brand Name	Plant Success
Country of Origin	USA
Coverage	Medium
Customer Reviews	4.5 out of 5 stars 3,236 Reviews
Global Trade Identification Number	00689319012135
Item Form	Powder
Model Number	PRPSGW01
Number of Items	1
Specific Uses For Product	Plant Growth, Root Development
Target Species	plants
UPC	689319012135
Unit Count	28.34 Grams

Great White Mycorrhizae, 1 oz.

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