Grape hyacinth (Muscari armeniacum) is an early spring blooming bulb. Flowers appear from April to May for three to four weeks. The 4- to 8-inch-tall plants produce dark green, grass-like leaves. A thick tube-like stem grows with a spike of bell-shaped purple and dark blue flowers. The blossoms resemble grape clusters. Grape hyacinths are used for front borders, rock gardens, walkways and woodland gardens.
Clear an area in full sun to partial shade of all weeds and unwanted plants in the fall. This eliminates unwanted competition for nutrients in the soil.
Loosen the soil with a shovel to the depth of 12 inches. Remove rocks and break up large soil clumps. Spread a 2- to 4-inch layer of peat moss on top of the soil. Work the peat moss into the soil and rake the soil level.
Remove the top 6 inches of soil with a shovel. Pour 2 cups of bone meal in your hole and mix it into the bottom level of soil with a hand trowel. Spread 1 inch of sand on the bottom of the hole to reduce bulb root rot.
Place your grape hyacinth bulbs 3 to 4 inches apart or 10 to 20 bulbs per square foot in the hole with the pointed end up.
Fill the hole with soil, covering the bulbs with about 5 inches of soil. Gently firm the soil over the grape hyacinth bulbs with your hands. Do not compact the soil. Water the planting area thoroughly.