Viewing post #566332 by JonnaSudenius

greene said:Many seeds were designed to float - coconuts are one example; certain Iris seeds are another example.
It is one method of how they are dispersed during rain events. Here is a good explanation about floating seeds and germination.

http://answers.yahoo.com/quest...

Well, another thing to investigate. I had a look at the link Greene sent and I must say I don't believe always anything published, so I threw some Iris setosa in water and they float all. Will have to see what they do the next few days.
To me it's clear, that there is no 'general' advice, just experience.