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
Batteries Included?	No
Brand	Plant Success
Customer Reviews	4.5 4.5 out of 5 stars (3,238)
Date First Available	16 March 2013
Features	organic
Height	2 inches
Included Components	Instructions
Is Discontinued By Manufacturer	No
Item model number	PRPSGW01
Length	39 inches
Manufacturer	Great White
Material Type	Powder
Number of Items	1
Product Dimensions	3.81 x 10.16 x 3.81 cm; 41 g
Size	1 oz
Usage	Plant Growth, Root Development
Width	10 inches

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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