The CFPACS 2019 fall meeting and field trip took us to three locations in Southwest Florida. The first stop was Naples Botanical Gardens. The rainy weather from Nestor didn't stop those of us in attendance from having a great experience. Plenty of umbrellas and rain gear were present as well as members from as far away as Jacksonville.
Upon entering, you're greeted by a few Florida natives:
Progressing further up the sidewalk gets you to this mixed planting:
There were plenty of Thrinax radiata around dropping their white fruit. A very positive sign for one of our native palms.
A few Copernicia baileyana in the median against a background of Roystonea regia.
The entrance to the Visitor Center with more Thrinax radiata standing guard.
A rock garden inside the entrance:
The next two photos show the types of gardens and plants present in the gardens. Gardens with Latitude!
You have this view after entering the metal building:
No jungle is complete without a torrential downpour:
Water features add calm to the garden:
Greeted by silk floss on the way to the cafe:
Circle of Friends - perfect for our meeting:
The PalmTalk forums contain thousands of observations on the cold tolerance from a variety of locations and climates. One of the primary difficulties in determining cold hardiness of a particular species or variety of palm is that observations vary greatly, even at the same temperature in the same location. Therefore, hardiness can be more accurately expressed as a probability rather than in absolutes.
The goal of the attached list is to more accurately calculate the probability and degree of damage one could expect from a freeze on a particular species or variety of palm by consolidating the available data into one document. This list is provided without any warranty or guarantee, expressed or implied.
Several factors can influence the effect of a low temperature on a palm. These include:
Ultimate low temperature Duration of the freeze – time below 28F, time below 32F, number of days with low temperatures Weather before freeze – was it warm and sunny with plants in active growth or were the palms given time to harden off by a slower onset of below average temperatures? Advective vs. Radiational freeze? – Advective freezes are usually more damaging due to wind chill and less stratification. Overhead canopy/protective siting – Was the plant out in the open or under cover? Are there structures or plants being used as windbreaks? Canopy typically mitigates frost formation during a radiational freeze and windbreaks lessen the windchill effect during an advective freeze. Frost – did frost form? Wet vs. Dry – did the freeze come with wet/damp soils from a preceding rain storm or was the ground dry? Size and overall health of the plant – A healthy, mature palm is usually more likely to survive than a palm that was juvenile or unhealthy. Another consideration is how long a grower waited after the freeze to report damage. Sometimes damage will manifest itself weeks or months after the actual freeze. If a report comes too soon after the freeze, then the report could change.
When possible, the list is an attempt to consolidate observations into an easily searchable list that captures as many of the factors influencing damage and survival. Because new observations are constantly being added, this list is a perpetual work in progress.
The following resources were and are being used to build this list:
http://www.trebrown.com/palms_arecaceae.php - Used to build the initial list of palms since it is fairly complete and up to date. Observations added to the list were checked against this list. If the check failed, it was either because the name given is a synonym or another name needed to be added to the list. http://www.theplantlist.org – Used to check for synonyms of the palm species and varieties in the Trebrown list when no match could be found. www.palmpedia.net – Invaluable as a tool to check for synonyms and species potentially not listed by the Trebrown list. http://www.cfpacs.org/freezes-central-florida/ - The freeze observations at this site were added to this list and are also posted in the PalmTalk forums in the Freeze Damage Data section at the following URL: https://www.palmtalk.org/forum/index.php?/topic/40159-aaa-florida-general-palm-hardiness-data/ https://www.bg-map.com/noblick.html - The two tables available here were merged and duplicates were removed before expanding the list giving each observation its own row in the table. When the name of the palm in this list could be identified as a synonym, the name in this list was preserved in the Description field in brackets . There is a full list of citations at this page that includes several active forum participants. https://www.palmtalk.org/forum/ - Some of the hardiness observations throughout the forum have been loaded into this list. This portion will always be a work in progress. 201909190030_HardinessObservationsMasterData.xlsx
Please save the dates of October 19th and 20th for the Fall Meeting and plan on it taking place in the Naples/Ft. Myers area. Last I heard, Naples Botanical garden was to be one of the stops. If you are interested in serving on the board or having your garden included at an upcoming event, please feel free to respond to the email you received if you are a current or former member.
Further details and updates will be provided at the following thread: CFPACS 2019 Fall Meeting