RE: Highly Fertilized Greens
The brand names lives on advertizement and they have to hype thier products to sell it. The advantages to buying them, is the mixes that they have, the convience, and also the clovers are usually innoculated. Imperial clover I believe is a mixture of two varieties of innoculated ladino clover especially blended for you area (supposedly) and I have their names somewhere. The local farm coop will have several varieties for your area as well (why would they carry a varity not suited to plant in your area?) and also have the innoculant. You just have to buy the varieties and add the innoculant. Most of the seed including brassicas you can buy at your farm coop or ask them to order it.