Sweet potato is an easy crop to grow and so long as its started early enough should give a decent harvest. Slips are expensive to buy. They are not generally dispatched till May. Often they come unrooted building in further delay. Making your own slips is an easy alternative. Grab your favorite variety making sure they are sound. If you are
lucky they might even have started sprouting. I am not unmindful of biohazard which is why I always grow in boxes or containers for the first 2 years before letting anything grocery bought, loose in my soil. To be on the safe side, I never grow potatoes and garlic from this source.
But I digress. Sweet potatoes is one crop that is a year round preoccupation for us. We eat every part of it so a good leaf crop is every bit as important as the tuber harvest. Our sweet potato year starts in December. Even as we finish the main tuber harvest its time to start next year's crop.
My reasoning is, the more rootstock the bigger the tuber harvest. I have to heat my house so why not use the tops of radiator and the boiler to get my plants away.
Sweet potatoes love the heat on top of the boiler and all I have to do is keep the moisture levels right in the compost.
It's true they look anaemic coming out of the cupboard but they soon gain colour in afew days once exposed to light and are none the worse for their dark start.
We are careful when selecting the tubers from which our slips grow. Over the years we have learned that the largest are not necessarily best. So we look for tubers
where the skin has cured well, that are sound with the least nicks or blemishes. In years past when my growing was 90 percent failure and ten percent luck I used to save the biggest of everything for planting stock. It took years to realise that somewhere in the middle is often optimum and nowadays that is my rule of thumb.The white varieties are always the quickest to sprout. I am not sure if it is because of the higher sugar and lower water content. It is the same whether I am slipping on a radiator or in a cupboard.
My favourite variety is the red skinned orange tinged white fleshed variety from
The thing that never cease to amaze me about slipping sweet potatoes is the way production increases once the sprouting get
going. So long as the tuber is unstressed each one turn into a mini production factory. I find that just keeping the compost moist and moving the slips on encourage more productivity.
I pot on in garden compost with about 20 percent vermiculite and 10 percent worm cast. This works well for me, but I have learnt that compost mix is an individual thing. Once potted up the plants grow on at room temperature with no need for additional heat.
As most of the slips already have small feeding roots they settle quickly to soil and grow away readily.
Within a few weeks they become well rooted plants. These are transplanted as
soon as the white roots begin to show at the bottom. Some of the white varieties will be needing their second transplant by mid February and again by the time they are moved to the Keder Greenhouse to start hardening off by mid march. Hopefully some of you will be encouraged to take the plunge into DIY sweet potato slips.