well i use env_model entities for models (*.mdl) and for sprites (*.spr) i usually use env_glow but sometimes env_spritennnot sure if these 'plants' you want to add are models or if theyre sprites.. nbut for models heres an example sort of thing:nn

n{n"origin" "### ### ###"n"spawnflags" "2"n"model" "models/whatever.mdl"n"rendercolor" "0 0 0"n"angles" "0 ### 0"n"targetname" "whatever_u_want"n"classname" "env_model"n}n

nn-origin is self explanatoryn-spawnflags set to 2 means it drops to the ground (that way you dont have to place it perfectly in the map, depending on if its bone (or main bone if more then one) is positioned correctlyn-model is also self explanatoryn-rendercolor might not be needed as id assume the default is prob 0 0 0n-angles is only needed if youre going to rotate it, and its pitch yaw roll i believe, so usually you only want to edit the middle valuen-targetname is just anything, but ive found that if you leave it blank the model usually doesnt show up ingamen-classname is a given too