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First, keep in mind that Hydrangea Shrubs love humus-rich soil. You’ll get faster growth and more abundant blooms if you mix compost or humus in with your ground soil when you plant new Hydrangea Bushes.
When you're ready to plant, dig a hole that's twice as big as the root ball on your new shrub so that it has enough room. Well-loosened soil will let it easily spread new roots into the surrounding soil. More roots equal faster growth and tons of blooms in the summer.
Once you've found a full sun to partial shade location (any area that gets about 4 to 6 hours of sunlight with some shade during the afternoon) and dug your hole, place your shrub in the hole. Backfill the surrounding soil and water to settle the roots.
You can get incredible blue hydrangeas from alkaline soil with rotting leaves. Nikko Blue Hydrangea and Bluebird Hydrangea need acid to give you gorgeous blue blooms. It has been found that thickly mulching for winter with fallen leaves raises the acid level in the soil. If your soil is lacking in the acid, everything you do to increase it is one step closer to blue. Other tricks for making your hydrangea flowers blue: