Fesruary, 1923.) THE ORCHID REVIEW. 4r 
of plant. After root disturbance, water must be afforded very sparingly, but 
the surroundings should be kept moist to encourage root activity. 
CaTTLEYA House.—This is the resting period of the majority of the 
occupants of this division. But hybrids of Cattleyas, Lezliocattleyas, and 
Brassocattleyas have attained such numbers that there are at all seasons 
some that will be more or less active at their roots. Plants that have 
produced flowers during the winter months may be repotted as soon as new 
roots are observed to be pushing from the base of the last made pseudobulb. 
Among the winter-flowering species, plants. of Cattleya Triane, C. 
Percivaliana, C. chocoensis, and many of their hybrids, are pushing up 
flower spikes through the sheaths, and in order to bring their flowers to 
perfection a little extra water should be aflorded them at the roots. As 
soon as the flowers have developed, the supply of water should be reduced 
again and very little applied until new roots appear. 
Oncip1uMs.—Most of the winter flowering Oncidiums of the varicosum 
section, together with such as O. Forbesii and O. concolor, will soon have 
finished flowering, when they should be kept rather dry at the roots, but 
just sufficient water should be applied to keep the pseudobulbs from becoming 
shrivelled. The plants will soon begin to grow afresh, and any necessary 
repotting should be attended to as soon as roots develop from the young 
growths. These plants are best grown in pans, which should be only 
just large enough to accommodate them, as they need restricted rooting 
space. Pot moderately firm and place the base of the young shoot well 
down into the compost so that the young roots may soon get into it, thus 
minimising the danger of damage by slugs and woodlice. These Oncidiums 
grow best when suspended from the roof-rafters in an intermediate 
temperature. 
Vanpas, AERIDES, AND SACCOLABIUMS.—Many plants of these genera 
will be showing signs of fresh root action, and any necessary repotting should 
be attended to. Vandas and Aérides are best grown in pots or rather deep 
pans, whilst Saccolabiums give the best results when planted in teak-wood 
baskets and suspended. A quantity of crocks should be placed in the 
bottom of the receptacles to provide drainage. Employ clean sphagnum 
moss as a rooting medium, mixing portions of broken pots among it to 
allow the water to pass through freely. Fill the receptacles to their rims and 
arrange the materials higher in the middle of the pot or basket. Finish with 
a layer of living sphagnum moss over the surface. Clean the plants 
thoroughly from scale insects which infest the stems and axils of the leaves. 
Water the roots copiously and place the plants in an airy position in ar 
intermediate temperature. 
ODONTOGLOSSUMS, ODONTIODAS AND SIMILAR KiINpDs.—Many plants 
are developing their flower spikes. The inflorescences, when of sufficient 
