Companion plants should aid, but not outshine, the main attraction. So, if you choose any one of these 12 companion plants, ...

`David' phlox's sweet-smelling flowers are an ideal complement to mixed shrub and perennial borders. Phlox `David' is a can't-miss pick for gardens Skip to main content Skip to main content ...

It's a plant that will bloom for weeks in midsummer so make sure it has a good viewing spot. I've never staked it, but it will grow to 100cm (75 cm wide). How often should you water?

Some of the plants at the back of the bed, which are mostly David, reach heights of up to 4-5 feet, but others near the front get pinched back in May, so they end up much shorter.