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I have a conservatory which really helps bridge the gap between the greenhouse/outside and the propagator or windowsill. I have an old wallpaper table, topped with a sheet of thick plastic, then covered with capillary matting. There are bamboo canes underneath the plastic along the edges of the table, to prevent water leaks.This is a very lazy system, because I only need to water onto the table and the capillary matting waters all the little pots. This saves a lot of time. To be even lazier, I adopted a 'make' idea from Geoff Hamilton. At one end of the watering table is a gravel tray. The top of the tray is level with the top of the table and a 'tongue' of capillary matting goes into the gravel tray and transports the water to all the plants on the table. The tray holds about 3 days worth of water. But Geoff's idea goes even further - you can add a little frame into the gravel tray and sit a large square bottle of water (camping size or catering oil bottles or the like) upside down into the gravel tray. Open the stopper and water will glug out and fill the tray. The neck of the bottle needs to be lower than the top of the gravel tray but the bottle needs to be off the base of the tray, held on top of a frame (mine is just 4 short pieces of wood screwed together). When the water level in the tray falls to below the neck of the bottle, water will be replenished from the bottle automatically. When the level of water in the tray covers the neck of the bottle, water flow stops. This system waters for longer, depending on size of bottle.
Hi Silverleaf, yes I used pallets. I can get hold of them through work. I spent most of my time sorting and deconstructing the pallets to get the best, strongest pieces I could. It was worth the effort and I'm really pleased with the results.