This is called "rejuvenation" pruning. The best time to do this is right after they bloom. In my area that's now (yes, I'm wearing a light down coatit's New England). New growth should start to Weie Flecken auf dem Olivenbaum : r plantclinic The rhododendrons at Kruse Rhododendron State Natural Reserve What to Do with Your Snake Plant in May to Get Explosive New Leaf Growth Gardify Olivenbaum Blattpilz Spilocaea oleaginea Gelbe Bltter Flecken Was ist das fr eine Frucht? : r whatisthisplant