How to Grow Alstroemeria Flowers
- 1). Remove weeds, grass and debris from a site receiving full sun or dappled sunlight. Select a planting area protected from the afternoon sun if your region experiences summers that push soil temperatures above 70 F, which can cause Alstroemeria to cease flower production and go dormant.
- 2). Loosen the soil with a shovel and pickax. If your garden soil is clay, leave it undisturbed but on top, build a bed made of a blend of 70 percent organic matter, such as compost, and 30 percent perlite soil mix.
- 3). Dig a 2-inch-deep trench. Plant the Alstroemeria rhizomes two to three feet apart along the furrow. Refill the trenches with topsoil, covering the rhizomes until the furrows are level with the ground surface. Plant the rhizomes when the temperature is above 50 F in spring or fall.
- 4). Irrigate the rhizomes at planting and keep the flowerbed moist until stalks poke through the ground. Apply an inch of water weekly to established Alstroemeria.
- 5). Build a 2-inch-deep mulch ring around the base of each plant to keep the roots cool in the summer. Use bark, wood chips, compost or other mulching material.
- 6). Feed 2-year-old and older Alstroemeria in the growing season with a high-nitrogen fertilizer that also contains phosphorous and potassium. Apply it according to the manufacturer's instructions for the brand you selected.
