Clay soil should be amended with sand and compost mixed in. It should also be done well before the area gets planted in, so you'd better get movin. It helps to amend it every year until it is really fertile--you'll know the difference--you'll be able to see and feel it.
Here's the tip you will thank me for fifty years for: Before you do anything, else, add 1/3 more to your dirt in sand. Use the sand they sell for concrete. You can buy it at the home improvement store by the sack, or you can have a load delivered, or you can take all your buckets to the place that sells soils and bark. This one thing will make your plants have roots that happily sink deep and live well. The roots can't get through clay, the holes you dig will be like little tubs to drown your plants in, and the sand will make all the difference. Best of all, sand doesn't rot, so it will permanently work! I'm in the process of doing the same for my new place that I did for my old place >vbg< .
Login using the form on the top of the page to post feedback (if you are a registered user). If you have not yet registered, click here to do so. It's FREE!.