- 1). Gather seed from a banana yucca plant in late summer once the pods dry to a dark-brown color and begin to split open. Place the seeds in a 1-gallon sealable plastic bag filled with 4 cups of slightly moistened medium-grit sand. Press the seeds into the sand so they are completely covered. Place the bag in the refrigerator until the following spring.
- 2). Prepare a sprouting pot for each desired banana yucca plant. Fill 4-inch plastic nursery pots with a mixture of 3 parts succulent potting mix and 1 part medium-grit sand. Pour 1/4 cup of water into each pot to saturate the sprouting mix.
- 3). Sow one banana yucca seed in each pot to a depth of 1 inch. Press the soil firmly on top of the seed.
- 4). Stretch plastic wrap across the top of each pot to hold heat around the banana yucca seed. Arrange the pots on a warming mat set to 70 degrees F during the day and 60 degrees F at night. Keep the pots near a source of intense but indirect sunlight.
- 5). Check the moisture level of the soil once a week. Mist the soil with a spray bottle whenever it feels dry to a depth of 1 inch. Replace the plastic wrap after watering.
- 6). Watch for signs of germination in 30 days, but do not be discouraged if it takes longer since banana yucca seeds sometimes take up to four months to germinate.
- 7). Remove the plastic wrap from the pots once the seeds germinate. Remove the banana yucca seedlings from the warming mat once they grow to 1 inch in height.
- 8). Move the pots outdoors to a sunny, sheltered spot once outdoor air temperatures stay above 55 degrees F at night. Water no more than once a week to a depth of 1/2 inch.
- 9). Plant the banana yucca seedlings in a large permanent pot or sunny outdoor bed once they develop several sets of healthy leaves. Wait until the leaves have formed a spine at the tip before planting them outdoors.
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