Hello,
I am a novice cactus enthusiast and so any help would be greatly appreciated please!
I was gifted a lovely terrarium - a big glass bottle (turned on its side) with several small cacti.
I have noticed that a couple of these cacti have suddenly turned white on one side. The only change I have made is moving them to a window with more sunlight exposure. I don't know if this could therefore be some kind of sunburn, perhaps?
What do I need to do to allow them to turn green again?
Also, watering it a bit tricky as there are only 2 small holes through which I can access the inside of the glass, which makes it difficult to water the base of the cacti. So how would be best to water and do I need to slightly under-water them as this is a closed system (i.e. has no holes for drainage), or will the stones act to mop up excess water and stop it rotting the cacti roots?
I would appreciate any help!
Many thanks
