Little beads/balls that you put in water and they grow?

Where can you get these little beads or balls that you put into water and they will grow like double their size, in the UK they can be used for plants as well?
Thank you
I have some but miine dont seem to be growing that much? Do I have to put it into hot/cold water at room temperature or something, doesnt even say on the stupid packet which my freind got me?

One Response to “Little beads/balls that you put in water and they grow?”

  1. sami_said25@yahoo.com Says:

    maybe hot so as to soften the seed coat hence it overcomes its dormancy period and dissolve of the germinating inhibitors and supply with the correct type of light quality

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