. La pépinière-livre ; un guide complet pour la multiplication de plantes ... Jardinage ; propagation des plantes. Les racines des arbres greffés et fleuri. 151 racine est essentiellement une coupe. Tout jardinier sait que les racines commencent rarement symétriquement des deux côtés de la fin d'une coupe. Fig. 144 (à partir d'une photographie) montre les jeunes racines jaillissant hors de l'extrémité de la coupe. Tous les trois d'entre eux commencent à partir de près d'un point commun. Il s'agit d'un système asymétrique ou recto verso. Fig. 145 montre deux greffes racinaires, tirées de la vie, qu'ils avaient cultivées à l'expira- dn de deux mois après qu'ils ont été plantés en pépinière. Ils montrent

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. The nursery-book; a complete guide to the multiplication of plants ... Gardening; Plant propagation. ROOT-GRAFTED AND BUDDED TREES. 151 root is essentially a cutting. Every gardener knows that roots seldom start symmetrically from all sides of the end of a cutting. Fig. 144 (from a photograph) shows young roots springing off from the end of a cutting. All three of them start from nearly a common point. It is a one- sided or unsymmetrical system. Fig. 145 shows two root-grafts, drawn from life, as they had grown at the expira- Dn of two months after they were planted in the nursery. They show the same pecu- liarities of root development as the cutting does in Fig. 144. The reader now desires to know why the same one-sided method of root growth does not take place at the end of the root in the budded tree, for these stocks are dressed or trimmedâthat is, the tips of the roots are cut offâbefore they are set in the nursery row. The whole question turns upon how much the roots of the stocks are cut back. If only the very tip is cut off, and there is a strong root development above it, this tip will simply heal over and develop no side roots, or else what side roots do develop will be very weak. This is practically what takes place in the 145- Young root grafts. common treatment of budding stock. If, however, the root were very severely cut â back, the same development would no doubt start from the tip of the budded stock as from that of the root-grafted stock. Fig. 146, from life, shows how this may occur. The stock on the left is budded, that on the right grafted. Both were severely headed-in (cut off at T), and both have developed prongy roots. The budded stock was much longer than the other, however, and, therefore, its root system is stronger.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work..

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