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Aphids and spider mites are indeed two common pests that affect ornamental plants, making this choice the most accurate.

Aphids are small, soft-bodied insects that feed by sucking the sap from plants. They often congregate in large numbers on tender new growth, stems, and the undersides of leaves. Their feeding can lead to plant stress, distorted growth, and the potential transmission of plant viruses. Additionally, aphids produce a sticky substance called honeydew, which can lead to sooty mold that further affects the aesthetics and health of ornamental plants.

Spider mites, while technically arachnids rather than insects, are also notorious pests of ornamental plants. They thrive in dry, hot conditions and can cause significant damage by feeding on plant cells, leading to stippling or yellowing of leaves. Like aphids, spider mites can reproduce quickly, creating large populations that can overwhelm plants, particularly if boxwoods, evergreens, or other decorative shrubs are infested.

Both of these pests can significantly impair the health and appearance of ornamental plants, making them key pests to be aware of for anyone involved in landscape horticulture.