Thladiantha 



( 389 ) 



Thrips 



The best time is a few hours after a shower. Thin- 

 ning by hand is advisable, but in many rural 

 districts Parsnips are roughly thinned by the 

 draw hoe, in the same fashion as field roots. 

 The practice is not to be commended. 



Thinning out the branches is a prime feature in 

 the pruning of many fruit trees, especially stand- 

 ards. (See also PRUNING and GRAPE THIN- 

 NING.) The thinning of shrubberies is an import- 

 ant feature in their upkeep, as crowding means 

 the exclusion of light and air, and the development 

 of weak growth and unhealthy plants, with 

 possibly insect and fungoid attacks. 



THLADIANTHA. 



Greenhouse and hardy climbing herbs (ord. Cu- 

 curbitaceae). Propagation, by seeds, sown in heat. 

 Almost any garden soil will do, but a warm and 

 sunny position is necessary. 



Only Species Introduced : 



dubia, sum., hlf-hdy., flowers unisexual, yel., 

 fruits red, very ornamental. 



THLASPI. (BASTARD CRESS, PENNY 

 CRESS, BESOM WEED.) 



Although this is a moderately large genus (ord. 

 Craoifena), the plants referred to it are practically 

 all weeds, and none of them is worth growing in 

 the garden. Alpestre, arvense, and perfoliatum 

 are British weeds. 



THOMASIA. 



Greenhouse shrubs (ord. Sterculiaceas), rarely 

 seen in collections. Propagation, by cuttings of 

 ripened shoots, in sand, in a close but not warm 

 frame. Soil, equal parts loam and peat, with one- 

 eighth sand. 



Principal Species : 



inacrocarpa, 3', Je., red Botanical Magazine 

 (si/n. stipulacea of Dot- 1755). 



anicul Magazine 4111). solanacea, 4', Je., wh., 

 purpurea, 2', Je., pur., calyx the showy part 



small, the calyx is the (syn. Lasiopetalum so- 



showy part (tyn. Lasio- lanaceum of Botanical 



petalum purpureum of Magazine 1486). 



THOMAS'S PHOSPHATE. 



This, commonly known as Basic Slag, is a by- 

 product obtained in the smelting of iron. It lias 

 come into considerable favour of late as a phos- 

 phatic manure. The lime which it contains is in a 

 caustic state, and it yields from 12 per cent, to 

 20 per cent, of phosphoric acid, together with 

 quantities of magnesia, oxides of iron, silica, and 

 manganese. It is found that it gives much the 

 same results as superphosphate of lime, except that 

 while the latter may be beneficially employed upon 

 light soils, Thomas's Phosphate answers best upon 

 heavy and sticky soils. Fruit trees, Roses, 

 ornamental trees and shrubs, and lawns all stand 

 to benefit by its use, about 4 oz. to the square yard 



Thistle (xee Cardt/us and Cairns). 



Thistle, Jilcxsi'd (Silybam marianii 111} . 



Thistle, Cotfnn (Onopordon Acanthiinn). 



Thistle, Globe (see Kehinops). 



Thistle, Golden (see Protect, and Seolymv* hispan- 



iriis). 



Thistle, Hedgehog (see EcJiinoeactus). 

 Tliittle, Holy (Silybmn marianum). 

 Thistle, Melon (tee M'/mwtut). 

 Thistle, Our Lady's Milk (Silybum marianum). 

 Thistle, Soic ixrr Sinirhiis). 



being a good dressing. The value of the slag 

 depends upon its fineness. A good sample will be 

 as fine as dust. It should not be mixed with 

 sulphate of ammonia or loss will result, but it 

 may be mixed with nitrate of soda, if desired. 



THOMSONIA. 



A small and obscure genus (ord. Aroidese) of 

 tuberous rooted stove perennial herbs. They may 

 be treated in the same way as the Caladiums. 



Principal Species : 



nepalensis, 2', spathe grn., spadix grn., flowers 

 yel., Ivs. trisected (lyn. Hookeri). 



THOUINIA (syns. THTANA and VAHGASIA). 



An obscure genus of climbing or erect shrubs 

 and trees (ord. Sapindaceae), rare in cultivation. 

 Propagation, by cuttings in sandy soil in heat. 

 Soil, equal parts loam and peat, with sand. 



Principal Species : 



pinnata, 8', Je., st. erect shr., wh. 



THRINAX. 



Dwarf stove Palms (ord. Palmse) of great beauty. 

 Large plants of excelsa and radiata make fine 

 specimens for roomy houses ; they do best in 

 wooden tubs, or planted in borders. Propagation, 

 by imported seeds sown in strong heat. Soil, for 

 the younger plants loam and peat in equal parts, 

 with sand ; for the older ones rich turfy loam and 

 sand. (See also PALMS.) 



Principal Species : 

 argentea, 12' to 15', Ivs. parviflora, 10' to 12', 



silvery beneath. Broom Ivs. 2' long. Palmetto 



Palm, Silver Thatch. Thatch, Roval Palm- 



excelsa, 7' to 10', Ivs. 5' etto Palm. 



long, pale grn. above, radiata, Iva. 2' long, split 



glaucous below. to two-thirds of their 



multiflora, 6' to 8', Ivs. length (syns. elegans 



nearly round, with and gracilis of garden- ). 



about forty segments 



(syn. graminifolia). 



Other Species : 

 arborea (now Acantho- Morrisii, 3', Iva. nearly 



rhiza arborea). round, glaucous be- 



barbadensis, 12', Ivs. neath. 



fan shaped, with many Pumilio, Ivs. digitate, 



segments. with many segments. 



THRIPS. 



The insects popularly known as Thrips (Helio- 

 thrips Adonidum) are most familiar and trouble- 

 some to the gardener. There are very few under- 

 glass plants that are immune from their attacks. 

 Neither are outdoor plants free. Peas especially 

 affording them congenial food and shelter. Under 

 glass sponge and syringe have to be constantly 

 in use. Undoubtedly the regular syringing of 

 foliage plants will do much to keep down attacks 

 of thrips, although the insects have not that dislike 

 to water that red spider has. Amongst the most 

 useful remedies are Fir tree oil and kerosene 

 emulsion (see INSECTICIDES). Fumigation is 



Thorn (see Crattrgus). 



Thorn Apple (see Datura Stramonium). 



Thorn Bloom (see I/lex europtens). 



Thorn, Christ's (Paliiirtts aculeatus and Zhyplnis). 



Thorn, Egyptian (Aracia vera) . 



Tliorn, Garland (Paliurits aiistralis). 



Tliorn, Jerusalem (Parkinsonia aculeata). 



Three Sirds' On-hid (Pogonia pendtila). 



Thrift (see Armeria maritima). 



Thrift, Prickly (see Acantholimon). 



