Aucust, 1922.] THE ORCHID REVIEW. 251 
CULTURAL NOTES. 
By J. MAcKAy, ORCHID GROWER TO JAMES J. JoIcey, Esa, THE HILL, 
WITLEY, SURREY. 
GOOD many plants will by this time have completed their growth, 
and a great many more are rapidly approaching this stage. When 
growth is finished at this time, it is advisable to remove such plants as 
Cattleyas, wherever possible, to more suitable quarters, rather than leave 
them in a house in which others are growing actively. Where a house is 
at liberty for this purpose, these plants can have their special requirements 
better attended to. Here they may gradually receive more light and air. 
Such plants as C. Warscewiczii, C. Gaskelliana, C. Warneri, and their 
various hybrids, have not only completed their growth, but have mostly 
flowered ; water at the roots will yet be necessary, and should not be 
discontinued for some time to come. It is reasonable that the plants 
mentioned should demand conditions differing somewhat from others that 
are in the middle of their growing season. More air may be given them 
and less shading used. Do not withhold water too suddenly at the roots, 
but allow them to lapse into a dormant state gradually, otherwise the 
ripening process will be too severe, causing an undue check to.the plants, 
with, possibly, disastrous results afterwards. 
This month a good many Dendrobiums will be nearing the end of their 
growing season, and these may gradually be exposed to more air and 
sunlight. These plants, being in full leaf and also well rooted, will, with 
this treatment, require water more frequently at the roots. Their growing 
conditions will have to be kept up for some time yet, and top ventilation 
taken off sufficiently early in the afternoon to maintain a warm moist 
atmosphere. At this time light spraying overhead will be beneficial, as well 
as a check to attacks of red spider on the foliage. This treatment may be 
given to most of the warmer growing kinds, such as D. Phaleznopsis, D. 
formosum, D. Dalhousieanum, D. fimbriatum, D. thyrsiflorum, D. Findlay- 
anum, D. nobile, D. aureum, D. Wardianum, and the various hybrids from 
the latter species. 
Miltonia vexillaria, and the various hybrids, the majority of which have 
finished their flowering season, are already on the move with fresh growth. 
This month is a most suitable time for repotting them, and in order to keep 
them in good health and vigour it is necessary that they should have fresh 
material given them at least every two years. Some may require larger pots, 
others may need to be broken up and given smaller receptacles, in any case, 
a good potting compost should be used, such as osmunda, polypodium fibres 
and sphagnum moss in equal parts. They are not deep rooting plants, 
therefore plenty of drainage is necessary. Avoid overpotting them into 
large pots or pans. Finish the potting by surfacing with chopped sphagnum 
