can I use these seeds in a hydroponic system?

Mostly, yes! I had trouble using the peas in the hydroponic though.

What is the shelf life ?

Seeds have variable longevity according to type, temperature, moisture content, quality of original seed stock and packaging quality. Some seeds will store well for a decade or more under ideal conditions (primarily low moisture and low temperature), others for just a few years. A decent rule of thumb is that well packaged seeds in low temperature under 70 F (perhaps refrigerated or frozen) will likely be expected to germinate for 4 years or so, maybe longer. But one size does not fit all seeds. Check the suppliers' recommendations and warranties to be safe. Perpetuating your seed stock can be evergreen if seeds are harvested and properly prepared for subsequent years' seed stock. Good luck!

How many seeds per individual pkg?

I didn't count but quite a few in there.

Has anyone bought all 3 collections to get "180 different types of seeds?" I was just curious if you actually get an assortment of 180 different see

I did get them, and not one variety was duplicated! I was impressed. I loved the seed saving instructions on the back of the packets. I hope they keep doing this, their the only ones I know of that do that.

Product Dimensions	34.93 x 22.23 x 1.27 cm; 290 g
Part number	SGSHomesteaderCollection50
Expected blooming period	Year Round
Moisture needs	Moderate Watering
Sunlight exposure	Full Sun
Soil type	Sandy Soil
Manufacturer	JD Hardware LLC
Manufacturer reference	SGSHomesteaderCollection50
ASIN	B09RKKGGRS

Homesteader Collection - 50 Packs Non-GMO Heirloom Vegetable, Fruit, Herb Seed Varieties for Growing a Victory Garden - Plant & Grow Survival Food - Emergency Preparedness Gear

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