when do you harvest your sweet potatoes?

[rainbowgardener]

Very pretty! I like the carpet of heart shaped leaves. All the plants closest to the fence seem to be a bit stunted, the far end and the left side. I would assume that's because they are shaded more by the solid fence.

[applestar]

If I remember correctly Korean purple has a long maturity date. Those are dark red-violet skinned dry yellow fleshed ones right?

My eyes actually immediately went to the pineapple plant.
Did you grow that from the top of a pineapple? I just dug up, potted up and brought inside two of mine -- last to come inside because they had been planted in the ground this season. They each had a sizeable pup that were no more than a nubbin in spring, so they came in as 4 plants.... Now I have 6

[TheWaterbug]

Very pretty! I like the carpet of heart shaped leaves. All the plants closest to the fence seem to be a bit stunted, the far end and the left side. I would assume that's because they are shaded more by the solid fence.

Yeah, I'm not really sure what's going on. That's a concrete block wall at the end/left, and it gets pretty much full sun for most of the day. I'm standing facing NE as I took this picture.

My Australian uncle is in town this week, and he was telling me last night about his garden and his sweet potato bed. He says he likes to eat the leaves. I haven't tried that yet, but I've clearly got enough to go around, so I may pick a bunch this weekend.

[TheWaterbug]

If I remember correctly Korean purple has a long maturity date. Those are dark red-violet skinned dry yellow fleshed ones right?

[url=https://www.sandhillpreservation.com/catalog/sweet_potatoes.html]Sandhill says[/url] KP is supposed to be early, so I guess mine are late

Caro Gold is also supposed to be early, and Purple Delight is not listed in their catalog.

But the PDs were a substitute for Yala, which is listed as late.

So my entire bed is growing backwards

My eyes actually immediately went to the pineapple plant.
Did you grow that from the top of a pineapple? I just dug up, potted up and brought inside two of mine -- last to come inside because they had been planted in the ground this season. They each had a sizeable pup that were no more than a nubbin in spring, so they came in as 4 plants.... Now I have 6

Yes! [url=https://www.helpfulgardener.com/forum/viewtopic.php?p=258408#258408]I started 3 in water back in May-ish[/url], and only one ever rooted.

I think I put that one in soil right around the time I planted the sweet potato slips, or around mid-July. It's sitting amidst my sweet potatoes because they're inside a rectangle of bird netting, and something was digging into my pineapple when I left it outside. With such shallow roots I thought the squirrel (or whoever) was going to rip it out and take it away.

[applestar]

My sweet potato jungles, hoping boosting the heat index under the vented plastic will help:
[img]https://i290.photobucket.com/albums/ll272/applesbucket/642F65EF-204E-4055-95EB-5A9BBA362A21-32986-000017DD788BFCDE.jpg[/img]
[img]https://i290.photobucket.com/albums/ll272/applesbucket/712699B0-5257-48F3-BC24-DBB2B8B46F94-32986-000017DD81F2844C.jpg[/img]
Seminole pumpkin vines are growing along the left and are also semi-covered, but I saw some powdery mildew spots starting on them this morning after overnight muggy rain.

[Gary350]

Wait until cold weather kills the vines to harvest the sweet potatoes.

[TheWaterbug]

Wait until cold weather kills the vines to harvest the sweet potatoes.

What about in warm climes where there is no cold weather?

[TheWaterbug]

Hmm. There's not much going on down there. Saturday was Day 86 since planting the slips, and I've got a nice carpet o' green vines going on, so I did some digging:



I'm digging down about a foot into my double-dug soil, and there's just these tiny little roots.

We got plenty of hot weather this year, and I watered pretty generously at the beginning, but then I backed off quite a bit later, as I didn't want it to get soggy down there. I applied some Liquinox Grow 10-10-5 a few times early, but nothing in the last 6 weeks.

I'm well beyond the 1,200 heat units suggested for sweet potatoes, as "normal" temperatures would put me at about 1,400 right now, but this summer has been unusually hot. Should I just wait longer and start watering again?

[Gary350]

I plant sweet potatoes about 1st day of April. Frost kills them about last week of Oct. That is 7 months of growing. The mother plant makes the largest potatoes. Every place the vine sprouts roots satellite potates are not as large. I often get 110 lbs of potatoes from 3 or 4 plants. Sweet potatoes like it hot and dry and they don't seen to care if the soil is good or poor. They need full sun too.

[TheWaterbug]

Thanks! Based on that I'm going let them sit until at least Thanksgiving

How much do you water them?

[Gary350]

Thanks! Based on that I'm going let them sit until at least Thanksgiving

How much do you water them?

I don't water my plants we get 300 days of rain here in TN on average every year.

[Lianne]

well I'll be.... I decided I'd pull up my vines because the weather's been flirting with the low 40's/high 30's on the coldest nights the last few days and my leaves were starting to turn. all season long, I'd been sticking my hand in the dirt poking around and only found one small (about an inch in diameter) sweet potato so I thought the whole effort would be a dud.

little did I know....
[img]https://i46.tinypic.com/a5hsh1.jpg[/img]
I'd pull up all of these!

I started this with one store bought potato, and planted three slips when they were about 6 inches long, all in a 4x4 bed which was already growing an herb and japanese eggplants. the sweet potatoes were sort of an afterthought. this is my first year gardening and I'm just so excited now! great way to end my first season

[TheWaterbug]

Ooooooh. I'm hoping for a similar surprise. Because right now it's not looking so good

[Lianne]

it was truly a surprise! fingers crossed your garden will do the same for you. It's just a very small backyard garden I started for fun but I'm thrilled with the results - can't wait to expand and try to do bigger and better next year - maybe I can grow enough taters to share with all the neighbors on my cul de sac next time around

[TheWaterbug]

Hmm. There's not much going on down there. Saturday [October 13] was Day 86 since planting the slips, and I've got a nice carpet o' green vines going on, so I did some digging . . . . I'm digging down about a foot into my double-dug soil, and there's just these tiny little roots.

I'd completely ignored these in the ~10 weeks since then, and today I pulled up two of the plants to see if anything had happened:



They're not huge, but they look edible. But they're also cracked everywhere, and several of them are heavily veined. If my notes are correct, these are Caro Golds, and this is what I got from two plants.

The soil is still nice and loose; I pretty much just pulled up on the plant (which is still green and thriving in our 60+ degree December) and the sweets just came with it. I put the plant back in the ground along with the few remaining roots; I wonder if it will keep growing.

I turned off the automatic watering back in October, because we've had more than average rain this year.

So I'm psyched up to eat these tonight. If they're good I'll dig up a bunch more tomorrow.

[imafan26]

WOW! You have a very precise method for calculating when potatoes are ready. I use a much less sophisticated method. Sweet potatoes are supposed to be ready 130-170 days after planting. I mark 150 days on my garden calendar to check them, and I put a label in the pot with the planting date and expected date of maturity. As it turns out everything here takes a lot longer then what is expected. I dig into the container and feel the size of the potatoes. If they seem about right I pull them up. Since we don't get a winter here, the vines will not die down, so that is not a reliable sign. Sweet potatoes can be invasive, so it works better to keep them in large containers. It also makes it easier to harvest since I have hard clay soil. Thankfully, I don't have to move the containers much.
If I plant the right varieties, I can also eat the leaves

[TheWaterbug]

So I'm psyched up to eat these tonight. If they're good I'll dig up a bunch more tomorrow.

Well, they were terrible. After I put them in the oven, I read up on these guys, and evidently they don't really get sweet until they've sat for a month or two.

But I also wanted to clear out the space, so I dug up the whole patch. And got maybe 15 lbs. of sweet potatoes.

Some of the plants had nothing at all, others had tubers too small to eat, and a handful of plants had 2-3 good-sized 'taters. But nearly all of them were heavily split.

I've got them sitting in a storage room; I'll try eating a few in a month or so to see if they've improved.

So clearly I'm doing something massively wrong, since sweet potatoes are supposed to be easy to grow!! I think my soil prep was OK, because the soil will still really loose when I harvested. I may not have watered enough during the hottest part of late summer.

I'm going to try again this year, and I'll from a different slip vendor so I can start earlier.

[imafan26]

I'm sorry to hear that. I don't know what varieties you grew. I only grow the ones that do well in Hawaii and that I like. Sweet potatoes don't need a whole lot of water but they will dry out if they don't get enough. The soil cannot be too hard or the potatoes will not be uniform and not so easy to dig out. Drought stressed potatoes go deeper. Here it is kind of moot. It rains nearly every day for a short time and the humidity is high so the soil is warm and does not readily dry out. Sweet potatoes are wild and that's why I contain them in a pot, they take over. The sweet potato that is the most popular for eating here is actually pretty dry. It is called Okinawan sweet potato. The flesh is purple, firm, and on the dry side. Yams are actually sweet potaotoes that are softer, sweeter, and more moist than hard sweet potatoes. Maybe you did not really do anything wrong. Try planting a soft sweet potato variety. They would be called yams in the U.S. like Garnet or Jewel. True yams are not sweet they are starchy and are planted by tubers. Sweet potatoes are sweet but the flesh can be hard (dry) or soft and moist depending on the variety you select
Root splitting and oversized roots are usually a sign that they have been in the ground too long.

[Gary350]

Try a few different types of sweet potatoes next year. Try some experements too, till in some organic material then plant potatoes there and see what happens. You also need 12 hours of full sun. The potato crop is directly related to how much full sun it gets.

I was reading online once about different types of potatoes. As I recall there are about 200 different type of potatoes. Some potatoe grow best in cool weather while others do better in hotter weather. In TN I could never grow white Idaho or Russet potatoes larger than a golf ball. Red pontiac potatoes did much better they like hotter weather. Sweet potatoes from the grocery store did great in my garden as long as they got full sun. The new house we moved to in 1991 had no trees in the new subdivision so every thing in the garden did great but 20 years later when trees were 35 ft tall and made lots of shade it was very hard for me to get good sweep potatoes. I moved to a different house for 2 years with 3/4 acre of land the sweep potatoes loved it there full sun all day until 7 pm.