I planted three varieties of potatoes on April 1. German Butterball, Kennebec, and Desiree. A few weeks ago, the plants started yellowing a bit and getting crispy edges. I feared late blight, but discovered it was actually potato leafhopper, which I sprayed for, and they got new, darker green growth. At this point, although the vines are long and lying flat, they’re as green as ever and show no signs of dying back.
I dug some delicious new potatoes around July 10, but at that point only the Desirees had sized up well, many were as large as “grocery store size”. The Kennebec and German Butterballs were all golf-ball sized at best at the time.
I wonder if I should just let them go a bit, or cut the vines down, give them a couple weeks to cure their skins, and dig them. Our soil temps are 75 – 80F even at tuber depth, so I don’t know if I’ll get much more tuber growth due to the hot soil, unless the four days of rain we had cooled it off a bit.
they grow kennebecs here commercially. i would let them grow too much longer or you could wind up with big hollow ones. they plant in mid may and harvest in mid sept. here but we are a lot colder than you are…
I’m in your zone and have grown all of the potatoes you have in the ground. My potatoes have just stopped blooming. I leave mine in the ground till the stems are brown, then dig. I will get bigger and better potatoes that way.
I pulled much of the bed today. Some vines were still green, so I left those, and there are certainly more tubers still in the ground - there always are - which I’ll dig later. But the soil was unusually soft and friable, and these pulled out easily w/o the stolons breaking off.
Some nice bakers this time, and almost no mutants.
Fingerlings aren’t ready yet, which vexes me - I like them best for summer potato salad.
Kennebecs. A little scab, but got 15.8 lbs from a 10’ row (one pound of seed potato) after losses (some rotted at Center of row-too much rain) and some idiot (me) sliced several while digging. Adjusting for losses, my true yield was closer to 20 lbs per pound.