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).
A garden hydrangea is a woody, deciduous shrub measuring 5-6 feet or more tall by about as wide at maturity. Its large leaves, in shades of medium to dark matte green provide the background to the two different bloom forms: 1). Mophead or hortensia blooms, or 2).Lacecap blooms.n the South, think of French hydrangeas the way you would an azalea â prune after blooming. This usually means in July â certainly before the first of August. The plant will not be hurt by removing up to a third of the growth â the new growth that will appear after pruning contains the bloom buds for the next season.