[lemma=perennial] □ □
[lemma=perennial] [□] □
[lemma=perennial] □ □ □
This claim applies to ruminant animals whose sole energy / feed source thoughout their life span is derived from grass ( annual and perennial ) , forbs ( legumes , brassicas ) , browse , forage , or stockpiled forages all not containing cereal grain or concentrate . The most common indoor allergens ( called perennial ) are : pet hair or dander , dust mites and molds . For fescue ( a perennial ) , no credit is given for nitrogen release from soil organic matter or from a previous legume crop . The use of a stale seedbed also induces weed seeds ( both annual and perennial ) to germinate , and reductions in the " seed bank " can be significant . In southwestern Missouri , switchgrass and caucasian bluestem ( an introduced warm-season perennial ) are used by beef producers to supplement the tall fescue ( Roundtree et al ., 1974 ) . Grass ( Forage ) Fed - - Grass ( annual and perennial ) , forbs ( legumes , brassicas ) , browse , forage , or stockpiled forages , and post-harvest crop residue without separated grain shall be at least 99 percent of the energy source for the lifetime of the ruminant specie , with the exception of milk consumed prior to weaning . This white Gomphrena , an annual , blends well with a white salvia ( tender perennial ) , lavender butterfly bush ( perennial ) and burgundy coleus ( annual ) . Very few herbicide materials will control grasses ( annual and perennial ) , broadleaf weeds , and vines , thus requiring the application of more than one product to provide broad spectrum control . These forms of teosinte differ in their growth pattern ( annual and perennial ) and ploidy . Unfortunately , many seed mixtures and blends available to homeowners at local garden centers contain large amounts of ryegrass ( both annual and perennial ) and fine-leaf fescues ( creeping red fescues , hard fescues , etc. ) . Intermittent or perennial stream means a stream or part of a stream that flows continuously during all ( perennial ) or for at least one month ( intermittent ) of the calendar year as a result of ground-water discharge or surface runoff . Examples : silver-leaf nightshade ( perennial ) and broomweed ( annual ) .