This section is from "The Horticulturist, And Journal Of Rural Art And Rural Taste", by P. Barry, A. J. Downing, J. Jay Smith, Peter B. Mead, F. W. Woodward, Henry T. Williams. Also available from Amazon: Horticulturist and Journal of Rural Art and Rural Taste.
It being a well-known fact, that the beautiful Tecoma jasminoides is, when cultivated in a pot, a very shy bloomer, I was very glad to learn that Mr. Bou-diart had, in the Jardin des Plantes at Paris, succeeded in grafting it on pieces, five or six inches long, of the Trumpet-flower, which is to be found in nearly every garden. When I bought a plant at Messrs. Parson's establishment, a young, very intelligent German gardener, who had charge of the green and hot-houses, dissuaded the experiment. By looking at the wood of both, he said he could tell at once whether two plants would unite by grafting or not. The T. jasminoides could not be grafted on T. radicans.
History is full of the mischief human authority has produced both in sacred and in secular affairs; I do not, therefore, believe in any thing that has been or is asserted by a man, however great he may be, if his assertion does not show internal evidence in itself. I tried the experiment, and am enjoying now the large and elegant flowers of the T. jasminoides, grafted in March on a piece of the root of T. radicans. The specimen in blossom is seventeen inches high; it commenced blooming more than a month ago.
In March, as stated, I took two pieces of the* root of T. radicans, each about six inches long and a quarter of an inch in diameter, and inserted in each a scion of the T. jasminoides. This process was, in some degree, difficult. The root of the T. radicans is very uneven, almost gibbous, so that the scion could not easily be inserted by cleft-grafting. To obviate the difficulty as much as possible, I made a triangular cut in the root, about three quarters of an inch long, and deep enough to receive the scion, cut in the same shape. The wood of the scion was young, but not succulent; it had but one eye, (bud;) part of the only remaining leaf was removed. Both were tied with woolen yarn without any grafting wax, and so deep planted that the bud of the scion was just visible. They were covered with inverted tumblers, shaded, and put in a hot-bed.
One of the scions began to grow almost immediately, the other failed; the root, however, sent forth two young shoots, one of which I removed, the other I cleft-grafted, after it had grown about four inches high, cutting it through just above a leaf. The operation was successful.
On removing a little of the soil, I saw then the cause of the failure. The root was decayed at the top. In order to arrest the progress of the decay, I cut the rotten part away, severing unintentionally the shoot, with the scion growing on it from the root. It continued, however, adhering to the soil, which was caused by a long thin root of its own. I cut it, therefore, from the piece of the old root, with which it was connected, and planted it carefully in a small pot, covering and shading it. It is now a beautiful, vigorous dwarf.
I hope the success of my experiment, so minutely described, will enable many to enjoy the beauty of so elegant a plant as Tecoma jasminoides.
[We have to thank Horticola for the details of the above interesting experiment; it will make Tecoma jasminoides tractable in the hands of many who would otherwise be deprived of the enjoyment of this beautiful plant. We have had the satisfaction of seeing the specimens thus grafted; the union is strong and perfect, and the plants in fine condition. The effect has been to dwarf them, and bring them early into flower. - Ed].