The improvement in growth is not evident until the second year when the bulbs that were fertilized at planting maintain vigorous growth and large flower size, whereas those not fertilized tend to become smaller and poorer in quality. Work it thoroughly into the top 4-6 inches of soil. After bulbs are established, increase fertilizer applications to 2 pounds per 100 square feet when the bulbs are in bloom. Avoid fertilizer contact with bulb foliage and scratch the fertilizer into the upper inch of soil. It is applied at the rate of 3 bushels per 100 square feet and worked into the top 8 inches of soil.
Manure can also be a source of organic matter.
It should be well rotted, for fresh manure may injure the bulbs. Do not exceed 2 bushels for each 100 square feet. In some localities where the soil is light and sandy, bulbs can be planted by the dibble method. Make a small hole in the soil with a short-pointed stick, place the bulb in the soil, and, after pressing the bulb down into the soil as far as possible, cover it with soil. In heavy soils, use a trowel to dig the hole for each bulb.