I use a very high nitrate fertilizer, so I thought it could be that what causes the leaf tips to get brown. I've reduced the strength of the fertilizer. Now I use about 2 ts on 5 liter of water. I think that proportion isn't bad because the browning of the leaf tips has not got worse.
Anyhow, I use this fertilizer on all of my not blooming orchids (phals, oncidiums, brassia, zygo, etc.) and they seem to like it. At least all of them have started growing new growths and all the phals are growing new big and strong leaves.
I'll keep you posted if it were new growths or spikes on my cyms.
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