At 01:26 30/10/04, you wrote: > I've made a simple change to my containers that has made a > considerable difference on heating and drying of the soil ... I use WHITE > pots instead of the ubiquitous black or dark green. The change in > temperature is quite noticeable, especially in the smaller 4" seed pots I use. Dave, The one problem with white or light coloured pots in our conditions at least is that we get extensive algae produced inside the pot due to the light penetration. It can be quite damaging to the root systems of some plants as it seems to bind the soil together and stop water from permeating the soil as well. I have bought things in small pots that are pale coloured and when repotting found that the whole root ball when dropped out is covered in a green film, which is quite solid when trying to tease the roots out. It is at least worth mentioning this for environments where the sun is fairly strong. The other problem with white pots is that they do not last as long as black pots (this applies to any colour other than black). The process of colouring (well at least here in Australia anyway) makes a plastic that degrades at a quicker rate, so I find ithat n our conditions smaller non-black pots tend to start becoming brittle within 3 years or so (sometimes quicker), whereas black pots last for at least twice that. This is not my imagination as I have talked to suppliers about this and there is scientific backing for this. I know a plant wholesaler near here who will not use anything but black pots, as they have less than half the life of the black pots in their conditions.... which tends to add up when repotting and reusing pots as often as wholesalers do. I agree with your temperature comments though..... it is just that you have to weigh up the pros and cons of the other side effects of the coloured pots. Cheers. Paul Tyerman Canberra, Australia. USDA equivalent - Zone 8/9 Growing.... Galanthus, Erythroniums, Fritillarias, Trilliums, Cyclamen, Crocus, Cyrtanthus, Oxalis, Liliums, Hellebores, Aroids, Irises plus just about anything else that doesn't move!!!!!