In Clark County, a fruiting olive is not permitted by county regulation. If you live outside of Clark County, then growing fruiting olives is acceptable by regulation.
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There is some discussion in academic circles whether crops grown in vertical farms aimed at feeding the world should be the higher-value horticultural crops or staple crops like multiple crops of wheat but with 70- to 80-day turnovers.
Lumps or bumps on the trunk are probably epicormic nodules, places on the trunk covered by thin bark that have a cluster of buds under it. These buds will sometimes grow into shoots. On some trees removing these shoots as soon as they are seen may cause these nodules to stop producing shoots or fewer of them.
Be careful when putting cactuses on an automatic water or irrigation timer. They are watered so infrequently that it sometimes makes sense to water these plants manually with a hose rather than automating the task.
Aphids are a big problem on new growth this time of year. Curling leaves is a spring indicator that aphids are present.