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The main problem with using only multi-purpose compost is that its only designed with a growing life of 6 weeks in mind - read the small print on every bag.It's also generally very light and lacks body. For prolonged growing you need to give it body, generally by adding top soil, and if you can get it well rotted manure (but not if you're growing root crops).Can't you rope one of your neighbors in to give you a hand?