UNDER the whole pot and the water level in the tray should be BELOW the
top of the pebbles. The pebbles go in a shallow tray and then is filled to
just below pebble level with water. The evaporating water helps raise the
humidity level around the plant.
In addition to what Tom said, it's not a bad idea to put a layer of pebbles
or broken clay pot fragments into the pot before adding soil. It's supposed
to aid in drainage. It's got nothing to do with humidity. The fragments keep
the drainage holes from clogging with soil. Actually, I've never seen that
happen, but I put fragments in my pots anyway.
Use a piece of screen or fine wire mesh rather than rocks, pebbles or broken
shards in the bottom of the pot. These additions do not improve drainage -
in fact they can impede good drainage by changing the textural levels the
water must go through. In the same manner that it is not recommended to
amend planting holes because of introducing different types of soil
structures that water will not move through smoothly and without slowing,
the same principles apply to plants in a container. In fact, unimpeded
drainage for container grown plants is even more critical.
pam - gardengal
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