Sigh... I don't want to be responsible for choking out NWO's wetlands! Heck, that would be my own back yard!

"It's the least fertile among all the cultivars tested by the University of Minnesota. 'Terra Nova' is a dwarf variety and will not spread all over the gard. Pretty, deep pink flowers. Much imporved variety in comparison with the other varieties! Does not sucker."

So it's the "least fertile", not sterile. I don't think there's any wild loosestrife around here but there is in Thunder Bay, and it will probably move west on its own even though there are efforts underway to eradicate it.

I winter-sowed some pink digitalis this year, so maybe that will fill the empty spot.

In all these years I have not seen it run wild, I also make sure that I cut the blooms down right after they have finished blooming before it has a chance to set seed.

Could you please ask your biology friend if this is still acceptable, otherwise I will get the roundup too.

Sharon

I did some googling. Could find almost zip specifically about the Terra Nova cross except what you quoted. But....I did read a lot of really interesting things related to the garden crosses.

I get my jollies from horticultural research...some may want to quit reading now....it is going to get boring.

In the early 90's, after Lythrum salicaria (Purple Loosestrife) had seriously invaded many waterways and wetlands, some states (including Minnesota) passed legislation to totally ban all species of Lythrum and all cultivars. At that time, many cultivars had already been developed for garden use. Even Morden had developed several cultivars/crosses. It was thought that these cultivars were either sterile or would not cross with the invader. Big controversy ensued. Why ban the cultivars if they were sterile, etc? So....Neil Anderson, Horticulturist at the U of MN did a major research project to prove or disapprove the sterility of cultivars. Here is a quote from the conclusion in his research abstract.
"This study showed that the cultivars are highly fertile when used as male or female parents with wild purple loosestrife, native species (L. alatum Pursh.), or other cultivars. Thus, cultivars grown in gardens could serve as pollen or seed sources for the continued spread of purple loosestrife."

University of Manitoba has also done several studies on this same issue. Here is a quote from their research.
"Manitoba Horticultural cultivars of purple loosestrife (Lythrum spp.) were developed in the mid- 1900s for use as a garden and landscape ornamentals (Harp and Collicutt, 1967). These cultivars initially were thought to be sterile and, thus, safe for horticultural use. Recently, Ottenbreit reported that artificial crosses between 'Morden Pink', 'Morden Gleam' (L. alatum Pursh x L. virgatum), and wild L. salicaria produced hybrid plants that were highly fertile. Further, Anderson and Ascher demonstrated that these cultivars are highly fertile when crossed with L. salicaria, L. alatum, or other cultivars. The authors of both of these papers concluded that purple loosestrife cultivars grown in gardens could serve as a pollen or seed source contributing to the spread of purple loosestrife in natural areas".

More interesting stuff out of Manitoba research.
"Literature on this topic has supported the concept of "good" (garden type) lythrum, and "bad" (noxious weed ) lythrum. Our study of floral and vegetative characteristics now reveal that there is no consistent difference between the weed established in a wetland habitat and garden lythrum offered for sale and grown in gardens. Examination of lythrums from a local infested wetland revealed a wide range of morphological characteristics, including size and color of petals, density of inflorescence, pubescence, alternate/opposite leaves, and so on. In other words, given the right conditions, any of the "garden type" lythrums could become established as a serious pest."

From Alberta:
"Gardeners have been led to believe that L. virgatum (a species not specifically included in the Alberta Noxious Weeds Act) would provide a suitable alternative to L. salicaria. Unfortunately these two species hybridize readily, making L. virgatum a part of the problem. Neil Anderson and Peter Ascher in their paper Male and Female fertility of loosestrife (Lythrum) cultivars, observe "...L. salicaria and L. virgatum...have both colonized wetland habitats, frequently becoming monospecific stands. These two species are considered by North American taxonomists to be the same, since they differ only by a few minor diagnostic characteristics and intercross freely."

More from Alberta:
"Much of the loosestrife literature mentions the existence of sterile selections--specifically 'Morden Pink'--that presumably would not produce seed, and would therefore pose no threat to wetland habitats. None of the loosestrife complex, however, are "safe". 'Morden Pink' is not the sterile plant that it has been claimed to be, and is, in fact, a parent of numerous selections including 'Morden Gleam' and 'Morden Rose'. A cross-pollination study out of the University of Manitoba concluded that lythrum cultivars may contribute significantly to the problem of the naturalization of purple loosestrife in this continent."

End of all quotes:
Has anyone made it to the end? Is that snoring I hear? I will creep quietly away in an attempt to not wake anyone.
Jan

I don't have loostrife of any type and now I will continue to avoid it. I figure when it comes to the environment it's better to err on the side of caution. There are some things you just can't undo however well meaning it started out.

Thanks for the heads up Marcia.

Lythrum X Terra Nova is not invasive on it's own, the issue is that it could potentially cross with a wild Lythrum salicaria and produce seed.

As a correction, Terra Nova Nurseries has absolutely nothing to do with Lythrum x Terra Nova. The reason it is called that way is because it was discovered by T. Huber in "Terre Neuve" which is french for Newfoundland. It is considered to be 'almost' completely sterile.

So, the question is now....do you suppose it would be passable to grow TN if one was to faithfully cut off spent flowers before the plant can set seed just incase they do cross pollinate with L. salicaria that are growing wild in the proximity?

Sharon

I think i will contact the Biology or Forestry Dept. of Lakehead University and see what they say. Someone there is sure to know how far west purple loosestrife grows.

What a dilemma! I'm ticked off at Dominion Seed House for selling it and not properly identifying it! (and maybe at myself for not researching it - but i seldom ever do, just buy something if i like it).

As I remember mentioning when this thread first came up last year, I'm really amazed that a large plant dealer could get away with selling noxious weeds, and perhaps even more that they would dare to.

If you go to Eastern and Southern Ontario you will see massive amounts of Lythrum growing everywhere. It is all over the ditches at our place in Ottawa and although we mow it down, our neighbors do not.

Nobody really knows if Lythrum salicaria is destroying the wetlands since the research is not conclusive. Art Drysdale, a noted author and horticulturist has argued this point and does not believe that it is invasive.

Have a look at either of these 2 articles for more info:

http://icangarden.ca/document.cfm?task=viewdetail&itemid=4154
http://www.artdrysdale.com/june2001.html

Why would Dominion Seed sell that Lythrum you ask? T. Huber or Tony Huber who discovered the plant works as a breeder for Norseco located in Laval, Quebec. Norseco owns Dominion Seed also known as Horticlub in Quebec.

Marilena

You make a good point concerning the 'other side' of the controversy. There are advocates for invasive species and some are real activists. Some of the activists promoting this school of thought tend to equate the introduction of plant invasive species with the much earlier European migration of humans to this continent. i.e. the plants have as much right to migrate to this continent as our ancestors did. I will never forget, when I first came to the GardenWeb forums, a thread on Lythrum on the Perennial Forum. To say it was vicious is a major understatement. I was horrified to be called a racist and worse. Things degenerated from there and Spike pulled the thread. So....yes, in some arenas introduced invasive species is a definitely a 'Hot Button' topic.
Jan

(I was going to bring up the Introduction thread and found this instead!)