Here’s a handy trick for determining whether acorns are likely to germinate and grow into mighty oak trees:
Throw a handful of acorns into a jar of water, discard the floaters and plant the ones that sink.
In our little experiment just 2 acorns out of 12 sank to the bottom. In the interests of conducting a proper, controlled scientific experiment we’ll be planting 2 of the floaters as well just to check 🙂
And now for the science: Acorns are prone to drying out which reduces their ability to grow into seedlings. Dried acorns have more air inside them and hence are more likely to float. It’s not a completely foolproof test but worth trying if you were a bit too enthusiastic with the acorn collecting.