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Yes, I enjoy gardening every weekend to unwind and enjoy the lovely plants and flower pots. I appreciate you sharing your lavender care tips. I should probably invest in some pots to take care of words from letters

You will want to water as the top dries out thoroughly, no more than 1/3 of the way down into the container. Do not water before the top dries out a little, and do not let it dry out, completely. This will differ in time, depending on the temperature, wind, and other factors.

A moisture meter can help:

https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm

They can be cut up and mixed in with potpourri, and they make a good fire starter because of the flammable oils. Here are more craft ideas:

https://www.gardeningknowhow.com/edible/herbs/lavender/lavender-craft-ideas.htm

https://jefferson.extension.wisc.edu/files/2012/02/Plant-Craft-Supplement.pdf

Go for Lavandula angustifolia ‘Hidcote’—perfect for Scotland, compact, super fragrant, and thrives in pots. Bees love it, butterflies visit, and the dried flowers smell amazing in sachets. It prefers full sun but handles partial shade. Use well-draining soil and don’t overwater. Trim after flowering to keep it bushy. Done!

There are others, and this article will go over that, as well as go over the care requirements:

https://www.gardeningknowhow.com/edible/herbs/lavender/growing-lavender-in-pots.htm

I suspect they need more water. Once they are established, you can hold back on watering if it rains regularly. Since you are using well draining soil, it won't hurt to water them often to get them going. Because you have them in large pots where the volume of soil is more than they need, just water right around the plant, you don't need to get all the soil wet, or it could stay damp too long and cause problems. Containerized plants do need more water than plants in the ground, especially during the summer, so water as soon as the soil feels dry to the touch. Here is more:

https://www.gardeningknowhow.com/edible/herbs/lavender/growing-lavender-in-pots.htm