Dame’s rocket has four flower petals, while phlox has five. In addition, if your plant has hairy leaves, there’s a good chance it’s phlox—dame’s rocket leaves are smooth.

The versatile cannabis plant could, some scientists think, one day be useful for lunar and Martian colonists. For now, researchers will subject its seeds to radiation in orbit and see what happens.

Rocket leaves are my favourite thing to grow and they never disappoint. It is quick to grow (you can start harvesting in four-six weeks), hardy against pests, perennial (grows year round) and ...