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Cleaning and disinfecting the seed-raising tray, prior to sowing the seeds, is essential to eliminate bacteria that can affect plant growth. Soak the tray up to 10 minutes, in a solution of 9 parts water to 1 part household bleach. Afterward, use dish-washing liquid to clean the tray and thoroughly rinse it with water. Fill the seed-raising tray, up to 3/4 inch from the top, with moistened seed-starting mix or equal parts of peat moss and vermiculite.
Eucalyptus deglupta seeds are shallowly sown -- a 1/16-inch layer of soil is sufficient coverage for the seeds. The soil must remain moist throughout the germination period. This is best done with a water-filled spray bottle because this won't wash away the seeds. Eucalyptus deglupta seeds require a humidity of about 100 percent. Covering the tray with plastic wrap can help raise the humidity level. To promote aeration, make holes in the plastic wrap.
To germinate the seeds, a shady area and a temperature of about 68 to 72 degrees Fahrenheit is required. Place a heating mat underneath the seed-raising tray to provide a consistent temperature. Eucalyptus deglupta seeds can germinate within four to 20 days. During germination, move the tray to a semishaded area. Once the seeds have germinated, place them in a sunny window or under grow lights. To avoid growing weak seedlings, expose them to a temperature of about 55 to 60 degrees Fahrenheit.
Eucalyptus deglupta seedlings first develop a set of leaves known as cotyledon leaves. Once the second set of leaves develop, also known as the first set of true leaves, it's time to transplant the seedlings in individual containers. Continue moistening the soil as needed, and apply a houseplant fertilizer per package instructions. After about three months, when the plants are about 10 inches tall and the last frost date has passed, harden them off and move them outside in a sunny area.