Allium is a genus that contains wild onion and garlic plants. These plants can bloom purple, pink or blue flowers. Alliums have shallow roots that grow well in just about any kind of soil, but will grow particularly well when compost is applied to the soil. Alliums also grow well in a herb garden that receives plenty of sunshine. There are at least 500 species of alliums, which can all be planted from seeds and can be found in northern climates. One of the most common species that is planted in gardens is the Allium hollandicum or Purple Sensation.
Wash the allium seeds in cool running water and store the seeds in an airtight container. Store the container above your refrigerator and wait for three to four days.
Plant the seed in an indoor garden pot at least 1 inch deep. Cover the hole and pack the soil down. Water the seed immediately with 1/2 cup water and place it on the window sill or a location where it will get sunlight. Continue watering the seed once a day with 1/2 cup water.
Transplant the seedling to your outdoor garden after four weeks or once the seedling has sprouted. Plant the bulbs at least 3 1/2 inches deep and 2 inches wide. Cover the plant with soil and water the seed bed three to four times a week or whenever the soil is dry.
Spread a 2 inch layer of compost over the seed bed and at least 6 inches away from the roots of the seedling. The compost can be organic material such as grass clippings, peat moss, dead leaves and manure.
Continue watering and wait for the flower to bloom in the middle of the following spring. Reduce the amount that you water in the winter to around two to three cups of water a week depending on the dryness of the soil.