This is a tough one.
I have a new succulent terrarium and am in need of watering instruction. I had instructions included saying to use a spray bottle and moisten at the base of the succulents. I am aware that over-watering can lead to root rot, so I want to make sure I do not get to that point. The middle of my two main succulent plants are showing signs of brown leaves. I feel quite certain that I have not over-watered just solely on the fact that I’ve watered once in the week that I’ve had it, but I am concerned with the browning. Everything I have read has said the lower/base of the plants will brown and those leaves will die, but as long as the middle/center of the plant isn’t turning, all should be fine.
You can see in the pictures attached that is exactly what I’m noticing. I have the terrarium indoors in in-direct sunlight during the day. Could you please offer some watering suggestions? I do not know if I’m even watering enough, I don’t see any of the water going down into the soil-is that a visual indicator I should/not see? Thanks for your time.
It’s hard to tell from the photos what is going on. The plant in the middle is a Haworthia and they are very sensitive to over-water. The bottom leaves dropping off look like they are rotting, rather than drying, which would imply over-water.
Terrariums are difficult to get the watering right. You may well lose a few plants before you figure out your own conditions. In general when a succulent is in a regular pot we water every 2 weeks (in our area), drench the soil and let it drain away so it is never sitting in water. In a terrarium you can’t quite do that since there is no drainage. So you water more often, but less water. You want to wet the soil, but you don’t ever want water sitting at the bottom (we add charcoal at the bottom of our terrariums to neutralize any sitting water). So you need to test it out over time – a small amount of water and then check the soil to make sure it is dry before you water again.