Na fóru Passiflora enthusiasts proběhla zajímavá výměna zkušeností mezi pěstiteli J. Blatschkem, M.Irwinem, D.Costenem a H.Woutersem o schopnosti mučenek přežít mráz. Uvedeny byly tyto případy přežití:
Edulis Nancy Garrison -3 st. C. Edulis forma edulis -5 st.C a -9 st.C pod bublinkovou folií. Actinia -8 st. C. Jutta, caerulea x loefgrenii, lutea, Morning Star x caerulea, Winterland, White Mirror careulea x amethystina sao sebastiao, Panda -8 st.C Pod ochranným přikrytím P. Silvie -12 st. C, P white Queen a White Wedding -6 st. C , edulis -5 st. C. Chráněné tacsonie, gritensis a cincinnata -4 st. C. V Chile pinnatistipula snáší -6 st. C. Lutea, membranacea, herbertiana, cinnabarina jsou hodnoceny jako odolné bez konkrétnějších údajů.
Je třeba upozornit, že jde převážně o krátkodobé vystavení mrazu v zemích s klimatem příznivějším než u nás. Mě ještě nikdy edulis nepřežila celou zimu ve skleníku temperovaném na 0 st. C. Nepřežil ani hybrid edulis x caerulea. P. alata vydržela 2x zelená až do jara ale zkolabovala, když se měla na jaře probudit. V pohodě přežívá P. herbertiana, a některé hybridy P. caeruley.
Podrobněji původní text:
Jayme, I agree flavicarpa is not at all hardy. Passiflora edulis Sims f. edulis is a little better with the selection P. edulis 'Nancy Garrison' supposed to be the best. I have grown it however and although it coped with the odd -3°C 27°F it died eventually. Myles Irwine
Dear All,
Just to tell yout that last year all my edulis that I left outside were frozen, starting with -2 degrees. One small flowering normal edulis Sims f. stayed alive and survived -5 degrees celsius without protecion or a sheltering wall etc. This year it has survived -9 onder a "plastic bubbles" blanket close to the ground without problems.
Your Henk Wouters
Dear Nicholas,
I've grown at least a 100 different species and hybrids of passiflora over the years and have always experimented with growing "tropical plants" outdoors in the ground without any protection. I live in England in a zone 8 (USDA) equivalent - in a slightly harsher place than Myles but a less severe place than Henk. Of course this is not an exact correlation but gives you an idea (happy to provide more detail off line)
I would recommend passiflora actinia as the next best hardy species after caerulea. I have had a very large vine for almost 10 years in the ground without any protection. If I am honest with myself I think that the maximum that it will tolerate here is minus 8 centigrade. However, my actinia has outlived my caerulea "clear skies" (tet) so perhaps it's even tougher than we give it credit for.
I have recently been experimenting with a range of actinia clones to see if some are even superior. I have had two additional plants outside for the last two winters not to mention two selfed daughters of the orignal plant.
Also have recently crossed "Jutta" with Actinia - which may be promising.
Regards David
Dear David,
Your correct with actinia. We had -9.4 here and one actinia lost most of its leaves. Another lost all. It has to be around -8, the same as Jutta. Other survivors here are caerulea x loefgrenii, lutea, Morning Star x caerulea, Winterland, White Mirror careulea x amethystina sao sebastiao and Panda. Under a cover P. Silvie (hardy up to -12), P white Queen and White Wedding (both hardy upt to -6) and my small flowering edulis (-5). I left incarnata x umbilicata outside but do not know yet if this one will thrive out again. Under my veranda where all my tacsonia's are with just protection below 4 degrees I had a constant flowering gritensis in the soil and even cincinnata dark pollen survives this cold in the soil. My idea is to grow more and more tacsonia's planted out in the soil in a way that I can extend my greenhouse a litte during the winter. The results are very promising. They keep on growing. You do not need to do much if you like to grow tacsonia's outside. I want to do an experiment with taking all plants down close to the ground in autumm and build a very low (lets say 80 cm high and 100 cm wide)/ tunnel greenhouse over them, kept open but used as shelter for the rain and protect a little when it's freezing. I think even edulis frederick wich resists up to -2 can survive outside like this. In summer these plants will grow faster and will produce more flowers. About hardy tacsonia's: In Chile, the most southern part where P. pinnastipula grows, this tacsonia thre resists up to -6. I hope to obtain seeds one day.
Yours, Henk Wouters Dear Henk,
Thank you for sharing the information. I too have have had Tacsonia survive on their roots to produce shoots again the following season - so for this reason I think that they are tougher than Myles suggests (but not much!).
Also I have had membranacea/lutea in the ground for several seasons as well as other hybrids of sub-genus passiflora (I do not want to be too hasty in saying that such and such is hardy because of mild winters versus hard winters.) Certainly herbertiana & cinnabarina are very much stronger than many suppose. Myles is absolutely correct to talk about the severity of European winters - if we in europe can grow the plants then the range is hugely expanded.
Regards David Costen
|