The bracted twistflower only lives on some of the hillsides and hilltops on the western side of the city - where people like to live, too. Houses now occupy sites where it used to live.
Animals like Deer think it's tasty - and there are many more deer now than there used to be.
There are probably additional reasons for its rarity. Suspicion currently rests on recent increases in cedar density. The bracted twistflower may have some special soil requirements, too.
two possible strategies to save the bracted twistflower are Fencing to keep deer away from the remaining plants. Establishing new populations in suitable sites that are protected from development.The first step in this process will have to be discovering how to do this, since previous attempts have not been successful.
Seeds germinate in the fall. Plants grow as rosettes (see picture at right above) during the winter. They flower in April or May, sending up flowering stalks 1-4 ft tall with 4-petaled flowers. In the summer, the seeds in long pods ripen and then the adult plants die. Seeds can remain dormant in the soil for years.
They tend to grow on Rocky hillsides and slopes. It is usually found growing under shrubs, but it may not need shade; its present association with shrubs might be because deer have eaten the plants in the open.