photo credit: idaho department of parks and recreation. as we enter the heat of summer, flowers in many parts of the garden are slowly succumbing to the rising temperatures however, one plant that is flourishing . hesperaloe 6. english garden. in the children\u0027s adventure garden, a mass of planting of globe-shaped, blue-purple flowers draws a crowd in the heat of the day, nearly every flower head . ktvb \u0027. dahlia 2 dahlia 1. friends of the garden social 2014. plaza. saturday april 26 \u2013 leadership boise volunteer group placing commemorative pavers under the children\u0027s adventure garden entrance.