A traditional activity of planting a flower in a cup can be duplicated without any previous gardening experience. The cup should be plastic or foam for the purpose of being able to easily create drainage paths. The cup serves as an adequate pot for the flower until the root system outgrows the size and soil volume. The cup also allows the flower to be mobile, enabling you to move it in and out of sunlight more easily than planting in the ground.
Things You'll Need
Sterilize the cup in a solution of one part chlorine bleach and nine parts water. Rinse the cup thoroughly.
Cut small holes into the bottom edges of the cup with a sharp cutting tool such scissors or a kitchen knife. The holes should be small enough to prevent the soil from falling through yet large enough for water to drain.
Fill the cup one-third of the way with potting soil. Lightly pack the soil into the cup with your fingertips. The goal is not to pack the soil airtight but to make it able to hold moisture for a time before passing it on to be drained from the cup.
Place two or three flower seeds into the soil and lightly water them. Fill the cup to within 1/4 inch of the top of the cup with potting soil. Water the upper layer of soil.