I have a Malva sylvestris. It came up beautiful with flowers all over, but now it is all brown. What should I do? Should I cut it to the ground or what? Thank you.
It's probably a result of heat stress and not enough irrigation. If the stalk/branches still have green in them, then you can cut the plant bak and water it well. It may simply have gone into early dormancy because of the excessive heat across much of the country. If there are n signs of green or any life, then unfortunately it will need to be pulled up.