Brassicas can be planted in seed trays or directly sown into their final growing position. According to Wikipedia, brassicas ...

BUT, since manure tends to increase the acidity of the soil, and brassicas will not thrive in acid soil, this does cause a ...

Most brassicas are relatively easy to grow; however, unless you're an experienced gardener, cauliflowers are best avoided. For a first time grower, try a variety of cabbage, Brussels sprouts or kale.