The ongoing care of a lasagna bed includes weekly and seasonal replenishment.

At first the bed will be about two feet high but it will gradually sink as time goes on.  After about a year to 18 months as decay and worms do their work turning the leaves and organic matter into soil. the bed will be reduced to half its original height.

You will need to feed your bed about once every week or two.  To do this, for a four foot by eight foot bed, you'll need two coffee cans (1 pound 14 oz each) stuffed with unused fresh produce such as tops from carrots, bottoms from lettuce and cabbage, apple cores, etc.  You can make a little hole in four different places in the bed and put half of each can in the hole.  Cover with leaves to prevent attracting critters.  

As for feeding your plants, there are few things better than compost tea.  Get a five gallon bucket with a lid. Dump some unused, uncooked produce from your kitchen in the bucket along with some coffee grounds which are rich in nitrogen and potassium.  Fill with water near the top.  Cover tightly with a lid.  Keep the can near your garden and use to water your plants once a week.  Just continue to add more spoiled produce and water each week.  Make sure and leave about 1/8 of the water in the bucket as this ensures you'll have plenty of microbes as a starter for the new batch.

In the winter you can let your bed  rest.  In December, cover  the bed with leaves and water well so your leaves don't blow away. This will also discourage pests from over-wintering in your leaves.  Return to it in March.

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