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Stan
Joined: Wed Oct 31, 2007 5:52 pm Posts: 10687 Location: Hayward- S.F. Bay area Ca.
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Ravenea rivularis.
I know we have newer members looking for palms that can take some frost and cool winters.
Last edited by Stan on Thu Apr 26, 2018 1:52 am, edited 1 time in total.
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Sat Dec 30, 2017 5:12 am |
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julrodmes
Joined: Mon Oct 23, 2017 9:29 pm Posts: 455 Location: cantabria spain
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Re: Ravnea rivularis.
Indeed! Here´s mine at 43º N. It is 3 mts tall. It´s been 5 years in the ground plus 4 in a big pot. It brings forth 4-6 leaves a year. It loves water, that´s why it is very healthy and "kicking" in this weather. As you can see, it is developing a trunk. So far, it has withstood -1ºC, -1,5ºC for short periods of time. These pictures have been taken today ( max:22ºC, min: 14ºC)
_________________ Julio
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Sat Dec 30, 2017 6:27 pm |
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Stan
Joined: Wed Oct 31, 2007 5:52 pm Posts: 10687 Location: Hayward- S.F. Bay area Ca.
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Re: Ravenea rivularis.
For years they have a bottle palm like base. They seem to be fatter in climates that are not tropical.
Last edited by Stan on Thu Apr 26, 2018 1:52 am, edited 1 time in total.
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Sun Dec 31, 2017 3:44 am |
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julrodmes
Joined: Mon Oct 23, 2017 9:29 pm Posts: 455 Location: cantabria spain
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Re: Ravenea rivularis.
As I said in a thread related to trees, for those people who have gardens on the south coast of England, Ireland, Wales and inner London, they should give a try to not so hardy palm trees such as Howea, Archontophoenix, Arenga engleri, Syagrus romanzoffiana,Livistonas, Rhopalostylis and Trithrinax. Apart from the very hardy ones (Trachycarpus, Raphidophyllum and Nannorrhops) and the hardy ones (Butia, Jubaea, Phoenix, Brahea, etc.) The trick is to have a 40-60 mts. above sea level south facing slope, with a canopy of evergreen trees to protect those palms. Canopy makes a difference of more than 4-5 degrees with sorrounding spots.
_________________ Julio
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Sun Dec 31, 2017 12:33 pm |
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Paul Spracklin
Joined: Tue May 05, 2009 3:55 pm Posts: 2564 Location: North Thames delta UK
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Re: Ravenea rivularis.
Julio
Pretty well all those palms you mention have been tried over the years. There are a couple of main issues as to why why they are not widespread. We generally don't get hot enough summers for a lot of them to be able to grow (more accurately heat degree days, but that is complicated!). Nevertheless a lot of people have tried. The main reason is that many experimental plantings were killed off by a run of cold winters a few years ago. Places along the coast that would normally not see a frost from one year to the next saw temps down to -6C or lower. People are gradually trying again but really we are too few when you look at the country as a whole - there is no widespread established culture here for growing borderline hardy plants.
_________________ visit my website - www.oasisdesigns.co.uk
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Sun Dec 31, 2017 2:29 pm |
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garytheflounder
Joined: Fri Dec 31, 2010 10:32 pm Posts: 241 Location: Brighton Sussex uk
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Re: Ravenea rivularis.
Out of those mentioned, livistona lasted through narnia and the following years dry cold, but a cold wet spring done for it. Syagrus legged it to plant heaven from an unheated greenhouse. I have a small t. campestris which appears to not be bothered by our weather......and I'm still waiting to try rhopalostylis
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Sun Dec 31, 2017 3:21 pm |
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julrodmes
Joined: Mon Oct 23, 2017 9:29 pm Posts: 455 Location: cantabria spain
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Re: Ravenea rivularis.
We haven´t got hot summers here. Average temperatures for the hottest month (august) don´t even reach 20ºC in many places. Many of these "not so hardy" palms are growing in shady and cool places, nevertheless, they keep on growing, more slowly, but growing. There´s a brahea armata (a species that needs more heat than the others I mentioned) growing in such conditions and it´s been there for 10-15 years and only set 1 leaf every 2 years or so, but it is alive ( I´ll post a picture when I pass by). That´s why I suggest trying these palm species, because they don´t need so much heat and they don´t mind rain in winter. What they don´t like is dry cold as you mention for long periods of time, and here comes "canopy" because it avoids them to get "fried" despite stopping growth for a time. Those -6ºC you mention turn into "only" -1ºC or -2ºC if under canopy.
_________________ Julio
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Sun Dec 31, 2017 5:24 pm |
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Bennz
Joined: Tue Nov 06, 2007 4:06 am Posts: 675 Location: Waimarama NZ
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Re: Ravenea rivularis.
I have always wondered why Rhopalostylis sapida is not able to be grown sucessfully in UK microclimates shaded from excess frost. In habitat some high altitude dense forest sites would have long periods of below 10C days over the winter months, and probably rare days when the temps are not much above freezing. Growth is slow in these conditions, but at least they grow. Archontophoenix cunnighamiana seems to have identical growth requirements in NZ, and I've seen them in high altitude habitat sites where the temps are very cool all year around. In both these cases the UK frost potential is the biggest problem I suspect, rather than the cool growing season, but the frost shouldbe abletobe protected from by shading. There are lots of R. sapida sites in NZ with less heat in the summer than London, for example. But for sure other factors such as photoperiod, light intensity etc might make all the difference.
_________________ Waimarama NZ Oceanic temperate climate
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Sun Dec 31, 2017 9:46 pm |
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Bennz
Joined: Tue Nov 06, 2007 4:06 am Posts: 675 Location: Waimarama NZ
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Re: Ravnea rivularis.
_________________ Waimarama NZ Oceanic temperate climate
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Sun Dec 31, 2017 9:48 pm |
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garytheflounder
Joined: Fri Dec 31, 2010 10:32 pm Posts: 241 Location: Brighton Sussex uk
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Re: Ravnea rivularis.
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Mon Jan 01, 2018 12:26 am |
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julrodmes
Joined: Mon Oct 23, 2017 9:29 pm Posts: 455 Location: cantabria spain
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Re: Ravenea rivularis.
Yesterday´s temperatures: Min.16º-max.19º. Today´s 10º - 17º(probable max). This happens because of southern winds blowing hard and the Foëhn effect they produce. Last December we "suffered" over 300 litres of rainfall, and cool temperatures. Averages for December here are: 13º-7º. So, these high temperatures are not usual. In summer, southern winds mean max, between 35º and 40º, and min, between 20º and 24º, but are very uncommon. We also "enjoy" an average of 1.800 hours of sunshine a year (if lucky) which is not enough for many plants to develop properly. Going back to "not so hardy palms". There are people on north-western coast of France (48º North) who are growing them quite easily, even Juania australis and more tender ones.
_________________ Julio
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Mon Jan 01, 2018 9:45 am |
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David Matzdorf
Site Admin
Joined: Mon Oct 29, 2007 4:06 pm Posts: 5321 Location: Islington, London UK
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Re: Ravenea rivularis.
_________________ 51º33'07"N x 0º07'21"W
43m (142 feet) ASL
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Mon Jan 01, 2018 1:44 pm |
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Romain
Joined: Mon Dec 18, 2017 6:00 pm Posts: 32 Location: Berkshire, UK
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Re: Ravenea rivularis.
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Mon Jan 01, 2018 2:34 pm |
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garytheflounder
Joined: Fri Dec 31, 2010 10:32 pm Posts: 241 Location: Brighton Sussex uk
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Re: Ravenea rivularis.
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Mon Jan 01, 2018 2:40 pm |
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David Matzdorf
Site Admin
Joined: Mon Oct 29, 2007 4:06 pm Posts: 5321 Location: Islington, London UK
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Re: Ravenea rivularis.
_________________ 51º33'07"N x 0º07'21"W
43m (142 feet) ASL
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Mon Jan 01, 2018 9:06 pm |
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