In The Garden: More About Sweet Potatoes
I believe this the the third article I have written about sweet potatoes. It may seem ill timed as sweet potatoes are summer crops, but I hope readers will find value in this post at this time. Click the links below to read the sweet potato articles written here in the past. In The Garden: Growing Sweet Potatoes
In The Garden: Revisiting Sweet Potatoes
Most of us have been harvesting our summer sweet potatoes since November. Here in South Florida sweet potatoes function like perennial plants. While a frost and freeze will damage sweet potato vines our soil doesn’t freeze. The parts below ground do fine all winter long so that once you have sweet potatoes you will always have them. It is only necessary to create your slips once. After that there should always be sweet potato vines somewhere in the garden from which to take new cuttings. I have even discovered that discarded vines can not be trusted to die and decompose, rather, they grow where ever they are thrown down.
If you are a no till gardener like I am you understand when I say it gives me pain to dig up sweet potatoes, so when I harvest them from my winter garden I take the vines out as well as potatoes that are obvious from the surface. I don’t turn up all of the soil where the potatoes grew, and that has worked well for me. Then in the spring, as my winter crops are finishing, the parts that were left below sprout again just in time to cover the soil for the summer.
This year I have kale and cabbage transplants growing in the bed from which I took the sweet potatoes. While we had some very cold weather in October, we have otherwise had a mild/warm winter (It is the beginning of January now, so we may yet have cold weather.). Usually sweet potatoes will lie dormant below my winter garden only surging in the spring as the temperatures rise. Not so this year, even as the cabbages and kale are taking hold I am finding sweet potato sprouts coming up through the mulch between them.
I have been able to push my fingers into the soil around the potato sprouts, and slide long slim potatoes out of the ground without disturbing the young transplants on the surface. I have, so far in this way, harvested many lovely sweet potatoes from the garden this winter. In one case, as I began to push my fingers in to grasp the potato below, a very large earthworm ejected itself from the soil. I have to admit I was startled. It was a very big earthworm, night crawler size, and it actually launched itself out of the ground, and then quickly found its way back down into the soil where it landed, which brings me to another point about sweet potatoes.
Sweet potatoes are good for the soil. All summer long their vines and heart shaped leaves keep the soil covered. The mulch below the vines breaks down in cool comfort. The swelling potatoes gently move the soil repairing any compaction issues that existed before them. I find the soil below the potato vines to be black, well aggregated (lumpy) and loaded with worm castings. The weeds that are coming up around my transplants are easy to slip out of the soil where the potatoes were. The new crops are growing as if all of their soil needs are being met, and the soil is holding moisture much longer than the native soil.
Knowing what I know now about sweet potatoes preference for sandy drier soils I have often said I would not again put sweet potatoes in my better soils, but every spring like clock work the sweet potatoes re-sprout in this garden section where I originally put them, and I find that I like the effect they have there as much as I enjoy the food they produce.
Finally, South Floridians, put your sweet potatoes in the refrigerator. The cool temperatures increase the sweetness of your crops, and will inhibit sprouting.