just to add another spanner in the works. I have been trialling using a coarse layer at the bottom of pots, both deeper cascade pots, and shallow trays and the usual in betweeners.
with the deeper cascade pot which i have a juniper in, the one most recently i styled, i used a 20-25mm blue metal coarse layer at the bottom, then i added a mix of richgro aquatic and diatomite as the middle layer (medium) which i mounded up, then used a straight diatomite for around the medium and the top section of the pot, so far i have found this an excellent way to pot trees up,especially pine or juniper that like a "dryer" mix, the rate of drainage is unbeleivable much like turning on the tap in a sink it drains just as quick as water goes through the hose, and it becomes to that dry moist stage ready for the next watering. as i said, i am impressed.
the next medium sized pots (average 8cm deep) got potted with the same media and put in the same, not so much of a mound though, this has similar drainage ability to the deepr pot, but stays a little more moist then the deeper pot, obviously water tables are different, drainage the same, this i have found excellent for tropical species and the water loving trees.
the next one was my biggest surprise. a shallow tray, 45cm long, 32cm wide and 5-6cm deep, with a ficus in it, potted up the same as the deeper pot, but used a medium size media (diat. and richgro aquatic). no fine layer. It had the same great drainage as the previous, the difference between the medium sized pot (average 8cm deep) and the shallow tray was this has dried out a lot quicker much like the junipe in the deeper semi cascade pot, it makes sense as the medium used was a very coarse and a medium media ontop, lowering the water table right down making the trees needing a good water pretty much every day except if it rains hard.
the good thing i have found with this is that when it rains hard for a prolonged period, it drains very quickly and i havent had to put anything under one end to put it up on an agle to aid the water table in draining.
I probably should of put this in its own thread but beleive it to be relevent to these tests of late.
cheers
Jamie
