ALLEY OF OLD LIMENS
In the Summer Garden there are a large number of centuries-old lindens, on which you can find bizarre outgrowths – burls. This is a consequence of the molding trimmings of the 18th century. Since dormant buds provide partial restoration of the crown, not only due to damage, but also after pruning. It should be noted that linden has fairly soft wood, and the formation of burls significantly reduces the mechanical strength of the tree trunk.
Caps on trees appear for various reasons, most often it is a protective reaction to the introduction of pathogens or mechanical damage.
A cap is a growth (even rather an influx) on the trunk or root of a tree, the development of which is always accompanied by the formation of a large number of dormant buds.
Sleeping buds may remain unopened for a long time, but small branches may begin to grow from them. The burl is always covered with rough bark. The dormant burl buds are adnexal, that is, they are formed in the cambium, an educational tissue that ensures the growth of the stem in thickness. The kidneys produce a large amount of the phytohormone auxin, which stimulates the formation of new adnexal buds. The emergence of a large number of buds leads to an increase in the concentration of growth substances and, as a result, to the formation of a cap.
Their appearance is typical, rather, for deciduous trees. On coniferous trees, burls are a rarity. They can form on birches, maples, elms, lindens and other tree species. Burl wood of some species is valued in folk crafts for its strength and decorative properties.
Now you know what kind of growths are on the most common lindens.