The Garden Under Glass

242 THE GARDEN UNDER GLASS because it is little known, but for plants in large pots which have exhausted the stock of plant food in their compost it is a fine aid. We will take as an example a climbing plant in a greenhouse. It is already in a large pot standing on the greenhouse staging, and has its growths trained to Diagram 50.—Top-dressing: 1. Space lefl for top-dressing tomato twice. 2. A zinc collar («) put round top of pot to admit of top-dressing. 3. Ihe same idea carried out by making a mound of clay (i) over the rim. 4. Bottom dressing. Turves (c) set beneath a pot plant for the escaping roots to feed upon. 5. A box of soil (rf) set beneath for the same purpose. 6. Some soil taken away from old cyclamen and fresh put in its place (,). wires on the roof or the end of the house. It is desired to afford it more nourishment of a substantial character without taking it from the wires. It has, we will presume, been top-dressed to the füllest extent, and has the roots pushing through the several holes found in the bottom and. sides of large pots. The pot may be temporarily raised up, and a few squares of good fibrous turf laid beneath it