Hi, i have problems with several plants. Do you know what these have? We have them at work, so i don't know what species they are. What can i do? Regards fabian
Since it's rare for plants in different genera to get the same disease I'd say the condition is physiological. For example were the plants allowed to sit in standing water or perhaps there's a build up of fertilizer salts or tap water minerals in the soil. Monstera deliciosa Ficus lyrata (I think) Ficus maclellandii 'Alii' and possibly Pachira aquatica.
So, rinsing the soil what be a good option? How do you best do that with plants of this size? Should i cut them back too?
I would re-pot in fresh bark or coconut husk based potting mix and water with rainwater if you think your tap-water may have hardness, salt or other minerals that can damage plants (I.E. fluoride). Cut back only to shape.
Only if you damage them while repotting or if you find signs of decay (typically foul odors or mushy roots).