TRE 



603 



T R I 



trellises, which should be ample in their i important consideration where the sub- 



dimensions, strictly geometrical in all 

 their forms, and most accurately and 

 substantially executed. Nothing can be 

 more miserable in its effect on the eye 

 than a low narrow archway, the support 

 leaning in different directions, and the 

 curve of the ground plan and of the 

 roof in no marked style of determinate 

 line. The most accurate carpentry and 

 smithwork ought always to be employed 

 in such structures, otherwise they had 

 much better be omitted as garden deco- 

 rations. Some attempt forming trel- 

 lises over walks with long hazel rods, 

 but nothing can be meaner than the 

 effect: such rod trellis works or ar- 

 bours are at best fit for a cottage gar- 

 den, or a hedge alehouse." — Gard. 



TREMBLING ASPEN. Populus 

 tremula. 



TRENCHING is one of the readiest 

 modes in the gardener's power for re- 

 novating his soil. The process is thus 

 conducted : — 



<' From the end of the piece of 

 ground where it is intended to begin, 

 take out a trench two spades deep, and 

 twenty inches wide, and wheel the 

 earth to the opposite end to fill up and 

 finish the last ridge. Measure off the 

 width of another trench, then stretch 

 the line and mark it out with the spade 



soil is poor or bad, the bottom soil is 

 enriched and loosened for the penetra- 

 tion and nourishment of the roots, and 

 allowing them to descend deeper, they 

 are not so liable to suffer from drought 

 in summer; strong soil is rendered ca- 

 pable of absorbing more moisture, and 

 yet remains drier at the surfiice by the 

 water passing down more rapidly to 

 the subsoil, and it ensures a thorough 

 shifting of the soil.'- — Gard. Chron. 



In all trenching, whether one, two, 

 or more spades deep, always, previous 

 to digging, put the top of each trench 

 two or three inches deep or more, with 

 all weeds and other litter at the bottom 

 of the open one, which not only makes 

 clean digging, and increases the depth 

 o^ loose soil, but all weeds and their 

 seeds are regularly buried at such a 

 depth, that the weeds themselves will 

 rot, and their seeds cannot vegetate. 



TREVIRANL\. See Achimenes. 



T R E V I R A N I A pulchella. Stove 

 herbaceous perennial. Division. Light 

 rich soil. 



TREVOA. Two species. Green- 

 house evergreen shrubs. Young cut- 

 tings. Sandy loam and peat. 



TREWIA' nudiflora. Stove ever- 

 green shrub. Cuttings. Sandy loam 

 and peat. 



TRIBULUS. Eight species. Green- 



Proceed in this way until the whole of I house and hardy trailing annuals or 



the ridges are outlined, after which 

 begin at one end and fill up the bottom 

 of the first trench with the surface or 

 ' top spit' of the second one ; then take 

 the bottom ' spit' of the latter, and 

 throw it in such a way over the other 



stove evergreen trailers; the annuals 

 increase by seeds, and common soil 

 will suit them ; the evergreens increase 

 by cuttings or seeds, and grow best in 

 loam and peat. 



TRICHOCEPHALUS. Three spe- 



as to form an elevated sharp-pointed ; cies. Greenhouse evergreen shrubs 



ridge. By this means a portion of fresh 

 soil is annually brought on the surface 

 to the place of that which the crop of 

 the past season may have in some mea- 

 sure exhausted." — Gard. Chron. 



Bastard-Trenctiing is thus perform- 

 ed :— 



" Open a trench two feet and a half 

 or a yard wide, one full spit, and the 

 shoveling deep, and wheel the soil 

 from it to where it is intended to finish 



the piece, then put in the dung and dig . loam and peat. 



Young cuttings. Sandy peat. 



TRICHOCLADUS crinitus. Green- 

 house evergreen shrub. Young cut- 

 tings. Sandy loam and peat. 



TRICHOMANES. Two species. 

 Ferns. Hardy and stove herbaceous 

 perennials. Division or seeds. Loam 

 and peat. 



TRICHONEMA. Sixteen species. 

 Green-house, hardy and half-hardy 

 bulbous perennials. Offsets. Sandy 



TRICHO'PETALUM gracile. Half- 

 Division. 



it in with the bottom spit in the trench, 



then fill up this trench with the top hardy herbaceous perennial 



spit, &c., of the second, treating it in Light rich soil. 



like manner, and so on. The advan- TRICHOPILIA tortilis. Stove 



tages of this plan of working the soil epiphyte. Division. Wood with a lil- 



are, the good soil is retained at top, an , tie moss on the roots. 



