You are on a great track there! I would use a zoysia rather than St. Augustine for a neater tighter turf in such a small area. As you know the light is very limited but I would be tempted to consider some type of upright evergreen. While junipers may not quite get enough light an upright plant like Will Fleming Yaupon might do okay, although that is not a Monrovia variety. I would definitely include Monrovias 'Sienna Sunrise' nandina for dramatic cool season color and evergreen foliage. One of their Aucubas may also provide some evergreen interest for you.
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