Silt soil is composed of medium-size mineral particles, larger than clay and smaller than sand.. Silt soil has a larger percentage of silt (approx. 1/3 silt). It is very slow to warm up and dry out in the spring, delaying planting. Organic matter breaks down quickly, and there is a high risk of erosion by wind and rain.

Test Soil- This type of soil is similar to clay but needs a Soil Test before you start to determine the correct course of action as the soil pH can be acid or alkaline. It is important not to work a silt soil in wet conditions as it can take a long time to recover. The beauty of a silt soil is that it allows you to grow the widest range of plants. 

Improve Soil Structure- Whether a soil is sand, clay, silt or loam it can be improved with a generous amount of organic material such as compost, manure, shredded leaves or  a Soil Optimizer containing humus. Having organic material in your soil is the key to retaining water, and it won't interfere with soil drainage.
 

Adding mulch to soil helps reduce moisture loss, control weed growth, keep soil temperatures even, limit reflections from the sun, control erosion and reduce maintenance. Mulch can be either organic, such as bark mulches, bark chips, straw, leaves, and grass clippings, or inorganic, such as rocks or pebbles.

With all types of soils it is important to build good soil structure. A healthy soil should contain earthworms, as they are a key element within the natural cycles that have established themselves within the soils structure. Worms create a good texture, drainage and incorporate organic matter into the soil by helping to turn it into humus.

So if you are working in your garden and fail to find any worms then get some as soon as possible. Once you have added organic matter to the silt soil and solved any drainage troubles the worms should increase naturally, but to increase the numbers add a few to a compost heap and watch them multiply over a few months.

Raised Beds- Another possible solution to consider is the use of raised beds. A Cedar Raised Garden Bed for example is decorative, practical and and a more permanant solution for the average gardener. Changing the soil type permenantly can be an on going, labor intense and potentially costly battle.