Ask a Question forum→Double height potato bag?

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Surrey, United Kingdom
May 31, 2020 11:16 AM CST

I am new to potato growing and have three varieties growing in felt 7 gallon potato bags. I planted the seed potatoes near the bottom of the bags about 2 weeks ago and the growth has been incredible. After two weeks i have covered up the shoots in new compost several times and now the soil is at the top of the bag (with some shoots poking out). I'm just wondering if it would be a good idea to extend the bags so i can keep on covering up the shoots as they grow taller? Would extending the bag mean that more potatoes will grow from the plants? I'd probably do this by buying some more potato planting bags, cutting the bottom out and sewing them the to the top of my current bags.

Kind regards

Name: one-eye-luke US.Vet.
Texas (Zone 8a)
Quitter's never Win
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Jun 1, 2020 9:19 AM CST
The potato plant will run out of energy sooner or later and when it does the extra sack may not matter. If the tops are super vigorous and still growing fast, then it may be worth adding extra sack. But if the shoots are slowing down and not as green as before, then let the potatoes get big and fat, in the first bag.
NOT A EXPERT! Just a grow worm! I never met a plant I didn’t love.✌
Name: Dr. Demento Jr.
Minnesota (Zone 3b)
Jun 1, 2020 4:45 PM CST
IT is putting energy to grow vine; you are reducing the size and number of potatoes.
Potato bags DO NOT produce the way in ground do, OR in the manner adds show.
Name: Sharon Rose
Grapevine, TX (Zone 8a)
Grace of the Lord Jesus be with all
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Salvias Bulbs Amaryllis Lilies Clematis Region: Texas
Jun 1, 2020 8:49 PM CST
Depends if the potatoes planted were determinate or indeterminate. The determinate kind grow only around the original potato seed and not up the stem. Indeterminate will grow-up off the stem. Google the type/name of the potato seed you planted.

Many blessings for a wonderful harvest!
One to take to heart....1 John 4
Name: Dr. Demento Jr.
Minnesota (Zone 3b)
Jun 1, 2020 9:43 PM CST
With indeterminate, you will get less yield, in weight by allowing the potato to set out more and more stem tubers.

I have grown Purple Peruvian which , if allowed, will send out branches four or more feet and produce stem tubers where ever the branch hits soil that allows it (soft soil, or mulch deep enough to cause it to do so) .
You will get dozens of small tubers, the size of a large peanut but where the original seed potato was planted your potatoes will be fewer and much smaller than if you did not allow the plant to branch out and create all those tiny tubers.

This is from experience not some thing I read.
I have been growing it for years, one of the few potatoes where mulching the bed can be worse than not.
One of the varieties I grew last year, one new to me, tried to do this but the Purple Peruvian beat it into sub-mission with far more, larger stems .
Fingerling potatoes are more likely to do this, from experience.

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