l^t)ol)ol)enbron ^ocietp ^otesl. 
INJURY BY FROST DURING WINTER 1916-17. 
Contributed by Sir Frederick W. Moore. 
In most parts of Ireland Rhododendrons came through the trjdng winter 
practically uninjured. There are records of a few species such as R. ciliicalyx, 
R. SUBLANCEOLATUM, R. NuTTALLii, and R. Edgeworthii being killed, or 
badly injured, but in some cases we may infer that the death was due to debihty 
on the part of the plant, rather than to inability to withstand the degree of 
cold experienced, a degree varying from 15°F to 26°F according to chstrict. 
In proof of this it may be mentioned that in the same garden one plant of R. 
Edgeworthii was killed, another is practically uninjured. R. Nuttallii is not 
hardy in any part of Ireland, R. Edgeworthii only in a few favoured locahties. 
In all the collections visited by me in 1917, I found such reputedly tender species 
and varieties as R. ciliatum, R. Keysii, R. Griffithianum, R. Kingianum, 
R. Maddenii, R. calophyllum, R. “ Dennisonii,” R. “ Sesterianum,” 
R. “ FRAGRANTissiMUM,” R. FoRDii, quite Safe. Rhododendrons, especially 
the large broad leaved species, looked very miserable in March, and some were 
almost defoliated, but they quickly recovered and came away vigorously. The 
severest cold was early in the winter, but by far the greatest damage to plants 
was caused by the snow, frost, and icy storms of the last ten days of March, 
and first fortnight of April. It is remarkable to find in gardens where Veronicas, 
Hypericum olympicum, H. Hookerianum, Ceanothus thyrsiflorus, Fabiana 
imbricata, Phlomis fruticosa, Pittosporum mayii. Salvia Grahamii, were killed. 
Rhododendrons practically escaped injury. 
F. W. MOORE. 
January, 1918. 
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