My solution to this problem has always been to immerse the container in a tub of water for an hour or two. I do realize this not always possible, but it takes a while for the bark to rehydrate. calistoga Al

Calistoga Al's solution is your best bet. If it is not an option, try putting it in the sink with the faucet opened just enough for a constant drip for a day.

Good Luck!

If you can submerge the pot, do it.

When I have a stubborn container, I put the pot in a drip-tray and water from the top, then let the plant rest in the water. After a few minutes, I water again.

Another technique is to scratch the surface of the mix, or even poke a few holes throughout with a chopstick or similar.

Josh

I've been successful submerging smaller containers, but some are 15G or larger. I don't have a basin big enough to fill with water. Unless I bring them to the bathtub, which the boss wouldn't tolerate.

Are there any useful, safe surfactants/wetting agents that can be used with plants already in the medium, that are actually available to the consumer?

I have a large metal tub that I let mine soak in when this happens. Also have a long steel rod that i use to poke holes in the soil sort of like aerating a lawn.

If you dont have a tub get a large trash bag(thick one) and put the container in the bag and fill with water. You may have to tie the top around the rim of the pot but it will hold water in and let the soil soak.

mike