ive never heard of a white incarnata ?
just saw it on Logees website.
i would love to have a cutting once you get going.
I have 3 purple ones at least 2 are clones of each other, maybe all 3.
anyway, mine die every year in winter
and come back in late spring (New Orleans)
by the time thy are large enough to fruit
and time to ripen, its late fall.
interestingly, i always get fruit from them if i leave them in a 3 gallon container
with a 5ft pole for them to climb.
my large plant had 50ft of vines at least the first year and never fruited.
i rarely get fruit unless the vine is 3yrs old, or, the root system is contained.
if the plant knows it can multiply itself by suckers, then it will send out roots all over
and never flower.
if contained, the only way it can procreate is through seeds (fruit)
next year, i will put some 2x6 - 8 footers, 6 inches deep to contain the roots
for the one in ground.
the fruit takes a while to ripen.
it will feel almost hollow and very light, like its bad (its not)
dont pick, unless it falls off, or comes off with a light touch.
i just use a plastic bag around the fruit and piece of string to tie it.
The only thing i have to worry about, are squirrels and rats though.