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Trimming now will rob you of flowers this year if your lavender hasn't already bloomed. Lavender responds well to hard pruning in late fall or early spring. If you live where winter temps dip below 20F., cut back in the spring. Lavender will not break new buds on old wood so don't cut back past the last visible leaf buds. If it is very overgrown, remove old stems to the base of the plant. Also, use of fertilizer can result in excessive growth; try just placing 2" of compost around the base annually in spring.

Lavender is native to semi-desert regions of the Mediterranean. It likes hot weather, lots of sun, fast-draining (sandy) soil and not too much water. It will not bloom indoors; it just doesn't get enough direct sunlight. Lavender is a shrub and needs annual pruning to keep it from becoming woody and floppy. Don't use long-acting fertilizer. It will encourage green growth at the expense of flowers. Adding 2" of compost under the shrub is all it needs although a dose of liquid fertilizer after blooming is acceptable if you want a larger plant. The foam looks like the egg mass of the harmless spittle bug. It isn't a problem.

The best time to prune is after the flowers fade. Pruning before then could damage the new flowering sites, or prohibit flowering completely.

This article will help you care for these plants: https://www.gardeningknowhow.com/edible/herbs/lavender/growing-lavender-in-pots.htm

I grow lavender from seed and it starts out with 1 little stem. Yours will bush out if the are hard pruned annually. In areas with cold winters, this is done in early spring just as leaf buds begin to swell. In southern states, it is often done in the fall but spring is also OK. Always leave a few buds on each stem that you prune as lavender does not break new buds from old, leafless wood.

Lavender tree is just lavender that is shaped into a more upright form. Basic lavender care centers around using the correct potting mix, watering practices and growing conditions. Lavender does not like to be in wet soil. The roots will rot. Your container must have drainage holes. Between waterings, the top one inch of soil should dry out. To make sure soil by the roots doesn't hold on to too much water, add a handful of coarse sand, perlite or small pebbles to the mix. During the growing season, use fertilizer at half the recommended rate. Lavender comes from semi-desert regions; it likes hot, dry weather and lots of sunlight which is why it doesn't do well indoors. Read on: https://www.hgtv.com/outdoors/flowers-and-plants/herbs/lavender-trees

Lavender Hidcote will grow to about 18" in width, so I wouldn't plant more than two in a 26" diameter pot.