I grow my toms under glass in a long tray filled with gravel, and as Verdun mentioned, when watering I try not to splash the leaves - removing the lower ones helps here. It helps to avoid blight, but isn't bullet proof, unfortunately.
The gravel allows for free drainage, but also as a sump from which the plants can take up more water if they need it.
Yup. The pots, filled with compost ( and plants ) sit on a long gravel filled plastic tray an inch or so deep on the floor of the gh. I tie twine to the apex of the gh, and wind the stems of the toms around that to support them as they grow. There's a way of growing toms under glass in gravel using bottomless pots, which is called 'ring culture', this is sort of ring culture lite!
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The gravel allows for free drainage, but also as a sump from which the plants can take up more water if they need it.
Works for me anyway!
Tha nks everyone for your wonderful advice. Much appreciated. Maggie