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greenhousedc

Is my wisteria dead, can I save it, or do I need to start over?

greenhousedc
9 years ago

Our patio had an amazing 50-ish year-old wisteria growing on
a 25 foot long pergola. For the 8 years we've owned the house, it grew like wildfire
every summer, my husband pruned it moderately 2-3 times a season, and it was
always flush with purple blooms in May and again most Augusts (sometimes we'd even
get flowers throughout the summer). We've also never experienced any winter die
back, though it blooms very late in May before the leaves come out.

We had a gardener do a real hack job on it in 2012, they
actually just went along the edge of the pergola with a chainsaw with no regard
to what was being cut. I thought it might die from the severe pruning, but it seemed
to bounce right back in 2013 with great spring blooms. Then last spring, 2014,
we had a particularly harsh winter for Lower Michigan, followed by a late frost
and the vines never budded. All season in 2014 there were no leaves anywhere on
the older vines. We did have numerous new vines start growing out of the base
to maybe 3-4 feet up.

Yesterday, when I trimmed the vines (still no greenery yet,
it's too early), I found that most of the older vines were dead and rotted, 3
inch diameter vines would just break in my hands, especially in the older sections.

I fear there is no vine left to save on the top of the
pergola. Worse yet, I now believe the vines that were growing last year are
from the root that may have been grafted to the original vine, so not actually
the same wisteria. The new vines have
buds (I could find no buds on the older vines), but at the base of the bud,
pointing down, were small thorns – my wisteria never had thorns before.

I am crushed to think this amazing wisteria may be dead, but
I also realize I can’t keep wasting season after season hoping it will “come
back”. If it’s dead, I want to get going on growing a replacement as soon as
possible. But if there is any chance at all of saving the original vine, I’d
like to try.

What do you think? Is there anything I can do to save the
vine? Should I try cutting it back, completely removing it from the top of the
pergola? Should I try stressing the roots to make it grow? Or is the vine too
far gone? Are the new thorned vines a sign that it is growing off the grafted
root and I should give up on it?

If I replace it, do you have a species to recommend? I have
no idea what the original was, but apparently it is rare for most wisteria to
have such profuse blooming. Could it have been the age of the vine and not the
species that contributed to that?

Also, how should I replace it? It has ~1.5 foot diameter
base now, in a 3-foot circle surrounded by my concrete patio. Will I be able to
pull out the base and roots for a new planting? If so how? Will I need to use a
stump grinder instead? Can I immediately plant a new wisteria there? Or should
I wait for the roots to rot and how long?

Here it was in 2011:


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