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
Brand Name	Plant Success
Coverage	Treats up to 1,000 plants (4 inch)
Customer Reviews	4.5 4.5 out of 5 stars (3,239)
Global Trade Identification Number	00689319012135
Included Components	Instructions
Item Form	Powder
Item Type Name	Great White Mycorrhizae, 1 oz
Manufacturer	Great White
Mixing Ratio	2 gallons -- 1 scoop, 4 gallons -- 2 scoops, 50 gallons -- 2 scoops, 100 gallons -- 4 scoops
Model Number	PRPSGW01
Specific Uses For Product	Plant Growth, Root Development
Target Species	plants
UPC	689319012135
Unit Count	1 Grams

Great White Mycorrhizal Fungi Root Enhancer, Concentrated 3-in-1 Formula, 9-Strain 387 Spores/gram, 6 Million CFU/gram Bacteria, 2-Strains Trichoderma, 1 oz Treats 1,000

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