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I have no piped water, so unless mother nature provides, I only have a watering can and water in my water butts. I water seed drills if the day is dry and sunny - however I aim to sow on damp dreary days. I water the planting hole of plants, like corn or brassicas, but then never again. I encorporate as much rough chunky compost and rotted manure and leaf mould as I can lay my grubby little hands on to help water retention. I no longer bother to try growing spinach earlier in the year, but sow later - late summer time, when the air is cooler and things are less likely to bolt. I try to overwinter veg - amazing how hardy most veggies are, even runner beans will continue to crop into November! I also have an area on both plots that is shady for part of the day and that is where my lettuces live. I don't know if there is any truth to my feelings, but I figure that for example, a tomato that hasn't been flooded with water every day, but has ripened slowely in the sun and had to dig deep for its water, will be sweeter and have a stronger more robust flavour. I had buckets full of toms last year - with no extra watering, and I still have a wrack of squashes to use, all with no extra watering. I believe if you start to water plants, you are creating a never ending situation because the plants make shallow roots and will quickly wilt and dry out.