Stacia wrote:

I just got some tuberous begonia bulbs and planted them with Scott's
potting soil, left about 3/4 inch of space from the top of the dirt to the
rim of the pot, watered the little critters and left them outside per
instructions. The next day the soil had swelled to about an inch above
the pot! What the hell? The soil was used with other plants and it
didn't swell then.
What can I do to save my bulbs, dig them out and replant? They've only
been in the soil for 3 days so I presume that would be okay.
Also, are aliens involved?

Removing the bulbs, then removing a sufficient amount of soil and replanting
should be fine.

No aliens, but I bet your potting soil had water retention crystals mixed in
it. Once moistened, they will swell several times their size and could easily
result in the soil displacement. Either that or the soil had dried out
considerably since your previous use - because potting soil typically contains
a fair amount of peat, which when it dries out is very difficult to remoisten,
you could be experiencing a "floating" effect with the moistened soil rising
above the original level.

pam - gardengal