Careful and strong staking they must always have, not forgetting one central stake to secure the main growth at first. It is best to drive this into the hole made for the plant before placing the root, to avoid the danger of sending the point of the stake through the tender tubers. Its height out of the ground should be about eighteen inches less than the expected stature of the plant. As the Dahlia grows, there should be at least three outer stakes at such distance from the middle one as may suit the bulk and habit of the plant; and it is a good plan to have wooden hoops to tie to these, so as to form a girdle round the whole plant, and for tying out the outer branches. The hoop should be only loosely fastened--best with roomy loops of osier, so that it may be easily shifted up with the growth of the plant. We make the hoops in the winter of long straight rent rods of Spanish Chestnut, bending them while green round a tub, and tying them with tarred twine or osier bands. They last several years. All this care in staking the Dahlias is labour well bestowed, for when autumn storms come the wind has such a power of wrenching and twisting, that unless the plant, now grown into a heavy mass of succulent vegetation, is braced by firm fixing at the sides, it is in danger of being broken off short just above the ground, where its stem has become almost woody, and therefore brittle.
Now is the moment to get to work on the rock-garden; there is no time of year so precious for this work as September. Small things planted now, while the ground is still warm, grow at the root at once, and get both anchor-hold and feeding-hold of the ground before frost comes. Those that are planted later do not take hold, and every frost heaves them up, sometimes right out of the ground. Meanwhile those that have got a firm root-hold are growing steadily all the winter, underground if not above; and when the first spring warmth comes they can draw upon the reserve of strength they have been hoarding up, and make good growth at once.
Except in the case of a rockery only a year old, there is sure to be some part that wants to be worked afresh, and I find it convenient to do about a third of the space every year. Many of the indispensable Alpines and rock-plants of lowly growth increase at a great rate, some spreading over much more than their due space, the very reason of this quick-spreading habit being that they are travelling to fresh pasture; many of them prove it clearly by dying away in the middle of the patch, and only showing vigorous vitality at the edges.