Im new to gardening and working with a very small area so in a single, 18 inch cubed container Id like to possibly mix Dwarf Red Coreopsis, yellow Evening Primrose, and either Dwarf Firmament forget-me-nots or Flax Blue Saphyr. I have a sunny spot and am working from seed. Do you think these will live well together in the small space, or would you replace one or more plants with something else (and if so, what would you suggest)?

Thanks in advance!

Laura