The way that this form of metamorphism works is that rocks are scraped against each other causing them to be ground into a powder. Then this powder is reformed due to the pressure in the zone and the heat caused by friction of the two rock surfaces.ocks are classified by the processes under which they were formed. The differences in formation account for variations in the appearance of the rocks and, with some practice, you can learn to recognize the different types by sight. Metamorphic Rocks are rocks that have changed form due to heat and pressure.
Growing 4 to 6 feet in height and width, both mophead and lacecap hydrangeas can be used as specimen plants, in mixed borders or in mass plantings. The mountain hydrangea (H. macrophylla subsp. serrata) is a subspecies of bigleaf hydrangea that has slightly smaller leaves and flowers (see image at right).
Varieties. Hydrangea varieties that grow well in containers include the smooth or wild Annabelle hydrangea (Hydrangea arborescens), almost all the big leaf (H. macrophylla) varieties, such as the Nikko Blue (H. macrophylla var macrophylla) and Veitchii lace cap hydrangea (H. macrophylla var.normalis).oil. Use rich, moist, well-draining soil in the hydrangea containers. The pH of the container soil and the quantity of aluminum in the soil influences the color of the hydrangea flowers.