On 26/07/2016 13:45, Jeff Layman wrote:
If the pot has dried out, and the compost has shrunk (particularly if it
is soilless), then watering can have little effect as the water will
just run down the inside of the pot and not wet the compost
sufficiently. It is useful to observe how quickly the water exits the
pots after it is applied. It may help to add some washing-up liquid to
the water as that will help it to penetrate the compost. It can also
help to stand the pot in a large saucer.

Standing them in a bucket of water for half an hour will usually do the
trick.

Andy