I hear that cash paper and metal coin don't make very good mulch, else I'd suggest going round the banks for their notes.
As for other sorts of fertiliser, I gather there's lots of seaweed offshore, and if a small portion of that could be rounded up, we could keep the whole orchard in vigorous condition.
Yeah, that's right. Tax the banks more. That will help to solve their liquidity crisis and ensure that they lend more to small businesses. And close the tax loopholes. Because that's so easy and yet has never been tried before. Any panacea in fact, rather than face up to the basic, unescapable facts: the country's broke; we can't afford lavish public sector final-salary pensions with retirement at 60, when people will live until they're nearly 90; and those of us paying for this largesse whilst putting far, far higher proportions of our own income into pension schemes that are far, far less generous are fed up to the back teeth about the unfairness.