(January 2017) In the oil and gas industry, a drill bit is a tool designed to produce a generally cylindrical hole (wellbore) in the earthâs crust by the rotary drilling method for the discovery and extraction of hydrocarbons such as crude oil and natural gas. This type of tool is alternately referred to as a rock bit, or simply a bit.
Printer Friendly Version (PDF). Verbenas are long blooming annual or perennial flowers that possess the virtues of heat tolerance and an extremely long bloom season. Many perennial verbenas are relatively short lived, but their vigor and heavy flowering make up for this defect.They do well grown as annual flowering plants also, since they bloom quickly during the first season after planting. âHomestead Purpleâ Verbena (Glandularia canadensis), known for its long bloom season.railing Verbena (Glandularia canadensis; formerly Verbena canadensis): Trailing verbena is a native perennial throughout South Carolina. The plants have a low spreading form and will flower profusely all summer.
Verbena (/vÉrËbiËnÉ/ , vervain) is a genus in the family Verbenaceae.erbena has longstanding use in herbalism and folk medicine, usually as an herbal tea. Nicholas Culpeper 's 1652 The English Physitian discusses folk uses. Among other effects, it may act as a galactagogue (promotes lactation) and possibly sex steroid analogue.