I am sorry for this delayed reply to your gardening question. The spring rush has brought a deluge of questions and we are working hard to catch up!
What you read is true. It is best to build up a raised bed if drainage is in question. You need to try and plant things that can grow in the soil of the site rather than try to make little changes other than perhaps adding a few inches of compost rototilled deeply into a large area where you'll be planting.
Thanks for the question. Best wishes for a wonderful gardening season. Please stop in again soon!
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