■ (TB) 'May Frost'
, R. 2013). Seedling# 0920. TB, 34 (86 cm), Midseason bloom. Standards white; style arms white tinted slight blue; falls white, tinted faint blue around hafts; beards yellow in throat, white in middle and end, hairs based white and tinted very light blue at tips; slight sweet fragrance; slight ruffling. 'Sky Blue Waters'
. Stout Gardens 2014.
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-- Main.RPries - 2011-03-07
- TB May Frost was blooming at the Minnesota Landscape Arboretum, zone 4b, approximately May 27 - June 10, in 2017. -- HollyJohnson2017-04-01 - 18 Sep 2017