Thunbergia erecta receives mixed reviews in most landscapes. I have seen it used in shady landscapes as a foundation planting and it does not perform well. Plants are very sparse in the shade and are not vigorous enough to be competitive with aggressive root systems. I noted this plant used as a low hedge under black olive trees and it was not happy. My plant receives full sun and is doing almost to well.
Plants with small foliage are preferred for hedging use as the foliage is not ripped by repeat pruning with electric hedge shears. Clock bush has showy, purple, trumpet shaped blooms, and small foliage. Hedges are normally pruned every 2-3 weeks and the flower buds are cut off before the plant can bloom. Your flowering plant is a green hedge without color. Plants like hibiscus, ixora, and others never bloom because of the constant pruning. One of the big complaints at condominiums is that there is no color in the landscape. Hedge plants should be selected that have small leaves and lack showy flowers.
The Ficus hedge met these requirements but had invasive roots and now whitefly concerns. I noted that plants with fuzzy or rough leaf undersides are not preferred by the spiral whitefly. Silver buttonwood is a possible choice but needs full sun and does not take extended pruning without some branch dieback. This plant is better as a small tree. One of the best choices may be Viburnum suspensum which has rough leaf undersides and takes sun or shade and does well as a hedge. I have not seen this plant under whitefly conditions but suspect it may be a good choice.
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