Answer: These are both approaches that work, and if you are in a hurry you may find that planting some in the inside is faster in terms of total coverage. However, you may also find that the upper portion is difficult to keep watered. You might try using a water holding polymer in that soil. Make sure you are providing optimum growing conditions for your plant -- bright light, plenty of water, regular applications of fertilizer and possibly a compost tea plus an appropriate pot size. Also be sure to allow it to grow ample foliage so that it can power itself to grow quickly -- it can be best to hold back on the trimming until it has covered much of the form.
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