Hi Sorry to be the bearer of bad news, but I think your plant may have had it if the branches are all brown, it is what is called a standard (pruned to have one stem and a bush effect at the top) and they are harder to look after than the ordinary margureites. On no account cut the stem down or you will return it to an ordinary bush at best and would quite likely kill it, if it is still allive. If there is still plenty of green leaf left prune off the dead flowers and any brown leaves down to the green. It is worth noting that this plant is not hardy and as a standard on a stem would need a greenhouse to over winter in. Sorry if this sounds negative, good luck with your plant. It is not an ox eye daisy, although it looks similar it true name is argyranthemum frutescens and it is a tender perennial. Ox eye daisies are hardy, a different case altogether, Shaneystars treatment is right for them, but not your plant, unfortunately. H.