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
Customer Reviews	4.5 4.5 out of 5 stars (3,232)
Is Discontinued By Manufacturer	No
Item model number	PRPSGW01
Product Dimensions	3.81 x 10.16 x 3.81 cm; 41 g

Great White PRPSGW01 Premium White Mycorrhizae, 1 oz, 1 Ounce

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