Tim Behan, Massachusetts, U.S.A., USDA Zone 5-6.

Fig 1.
6 month old Yucca seedlings.
Photo by Tim Behan Copyright © 2000.

Tim Grows 24 different species of Yucca in his garden, most of the plants are being tested for their first winter.

Yucca aloifolia
Yucca arkansana
Yucca brevifolia
Yucca baccata
Yucca baccata ssp. thornberi
Yucca baileyi
Yucca carnerosana
Yucca elata
Yucca elata var. valencia
Yucca elephantipes
Yucca faxoniana
Yucca filamentosa
Yucca flaccida
Yucca gloriosa
Yucca harrimaniae
Yucca glauca ssp. stricta
Yucca glauca var. radiosa -Pinalino, Mts. = Yucca elata
Yucca glauca var. radiosa - Cliff, New Mexico = Yucca elata
Yucca rostrata
Yucca rupicola
Yucca schidigera
Yucca schottii
Yucca sp. "Colorado"
Yucca torreyi
Yucca whipplei

18 of this species were sown May 2000, on fig. 1 you can see some of all the seedlings at an age of 6 months.
It might be useful to know that Tim's Yucca seedlings, are a lot bigger than 6 months seedlings would be here in Northern Denmark, and it must be the higher day temperatures that makes the difference.

If you would like to see how Tim's Yucca seedling made it you can look at this page and read his report on Yucca hardiness for the winter of 2000 - 2001.
 
 

Climate information for Rhode Island:
Average of -19°C (-2°F) as the yearly minimum temperature (last 30 year average)
Average No. of days per year -12°C (10°F) or lower = 12 days
Average No. of high temperatures which did not exceed 0°C (32°F) = 25 per year
Yearly average of 1140 mm (45 inches) precipitation, this is equally distributed throughout the year. Around 90 mm of the precipitation is received as snow, (typical 90 cm (46 inches) snow cover each year).
Average first freeze = Oct. 15
Average last freeze = April 25

Tim Behan has made the following hybrids in his garden:

Yucca (constricta x filamentosa) x Yucca 'Filata', made by Tim Behan, USA in 2006.
Yucca filamentosa x 'Filata', made by Tim Behan, USA in 2006.
Yucca filamentosa "Tennessee form" x ''Filata', made by Tim Behan, USA in 2006.
Yucca flaccida x 'Filata', made by Tim Behan, USA in 2006.
Yucca flaccida 'Tennessee Big Bloomer' (formerly known as Yucca recurvifolia 'Tenn.') x 'Filata', made by Tim Behan, USA in 2006
Yucca filamentosa 'Tennessee form' x (reverschonii x thompsoniana).  Made by Tim Behan, USA in 2009.
Yucca filamentosa variegata x (reverschonii x thompsoniana).  Made by Tim Behan, USA in 2009.
Yucca 'Tennessee Big Bloomer' (formerly known as Yucca recurvifolia 'Tenn.') x (reverschonii x thompsoniana).  Made by Tim Behan, USA in 2009.
Yucca flaccida x (reverschonii x thompsoniana).  Made by Tim Behan, USA in 2009.
Yucca (constricta x filamentosa) x (reverschonii x thompsoniana).  Made by Tim Behan, USA in 2009.
 

Tim Behan is also collecting pollen for other Yucca-hybrid-breeders around the world, and I have been able to make some very interesting hybrids with pollen from his plants.
 
 

More information about hybrids.

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