http://oovagae.notlong.com/ 18 June 2008 Syringa reticulata 'Ivory Silk' / Ivory Silk Tree Lilac This tree was on the property when I took possession. It is a nice garden tree, requiring litttle care. The Tree Lilac is also called a Japanese tree lilac or Ivory Silk lilac. It is being used as a landscape street tree. It flowers more heavily than other lilac species. It is able to withstand winter temperatures as low as 30 degrees below zero.