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Thalia dealbata |
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| Common name |
hardy water canna |
| Family |
marantaceae |
| Life cycle |
perennial (Z5-11) |
| Flowers |
violet |
| Size |
6' |
| Seed ripens | early October |
Tall-growing pond marginal, with attractive leaves, and flowers on tall stalks in summer. Strangely, some internet references rate this hardy to zone 5, others only to zone 8. I gather that for hardiness in the colder zones, it needs to be set deeper, well below the freeze line. So I planted ours in the center of the bog, and it came through the winter with flying colors, bigger and bolder. So far, the one flower I've seen was more odd than attractive, but that's OK, too.
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| | fruit developing mid-July |
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We left this plant behind in our Pennsylvania garden (and wish it well); we don't grow it in Houston. Seed for this plant is included on my seed trade list One or more images of this plant are included in my stock photo catalog About my plant portraits
PlantLinks to other web pages about Thalia dealbata
Visitors to this page have left the following comments| John Stinson | May 16, 2010 | We had a hardy water canna installed in our koi pond April of '09, in which it grew to almost 8'! Did wonderfully until winter and I cut back the stems a few inches above the waterline in early Nov. We live in Chicago (zone 5), and it is now mid-May and it hasn't come to life yet - no green at all. Should it be coming alive and start growing by now? I fear it may be dead. Thanks much, John
Hi John,
I wouldn't panic just yet. I looked in our own pond, and couldn't find it yet (in the tangle of other plants growing in our bog filtration area). It's most likely a late riser. |
| Brian Hein | Oct 12, 2010 | I have a large hardy water canna that is in a small pond I made by my house, it's in a water basket that I take in for the winter (I live in northern Ohio).
My question is should I cut it back for the winter and how far?
The past two winters I've just taken it in as a full plant but it's large and would be easier to handle if cut.
Thanks Brian
We leave ours outside, and it dies back, only to return in late spring. So I think it should be fine to cut it back hard. |
| Jerry Novak | Jun 08, 2012 | I recently purchased a thalia dealbata per the nursery instructions I planted it
8" below the waterline. Is this the correct depth? Surfing around on line I've
found information saying to plant no more than 2" and others saying to plant from
12" to 18". Confused in Cleveland!!
I only know what works for us: ours is planted about four inches below the water line, directly into the pebbly medium of our pond filtration zone. It does very nicely, making its return every year in May. Recommended planting depth may depend on your climate – deeper in colder zones, to avoid freezing the overwintering roots. |
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