On Mar 10, 10:06*pm, Sacha wrote:
On 2012-03-10 18:14:41 +0000, "David WE Roberts" said:

Just to note that after all the heavy rain our olive tree in the pot is
waterlogged.

We left it too long in one spot on the ground and it has grown a root
through the drainage hole which is now blocked.

Some leaning over and probing now required.

The lesson to be learned from this post is Never grow a plant in a pot
with just one drainage hole.
You say that a root has grown through, you don't say if the Olive is
now firmly anchored to the ground by this root, if so then think about
removing the pot and building a small container round the base of the
tree/bush.
If it's not firmly anchored then think about lifting it and re poting
into a more suitable container.
Lastly you say after heavy rain the pot is waterloged, How fast did it
drain?
After heavy rain as with watering containers can look as if they are
waterloged but the water should drain away over a few hours.
David @ the wet end of Swansea Bay.