Hello! I have this jade plant that is dropping a leaf every day or two, and I'm wondering what could be the cause.
Background Info: Someone at work was getting rid of it, so I brought it home about 5 months ago. It was in a really small pot and was leaning over so far that the pot wouldn't stay upright. I repotted it in a larger pot with cactus soil and staked it upright. The pot does not have a drainage hole, but I put an inch of gravel in the bottom. I stick my finger into the soil and water when it is completely dry an inch or so below the surface. (FYI I watered it just before taking the pictures.) I have the plant in a room with a west facing window, but the plant is on the other side of the room. It does not get much direct sunlight but the room is well lit, so it receives indirect sunlight for about 7 hours. I live in Colorado so we have pretty low humidity most days. I also usually leave the window open at night, now that it's warm, and there is commonly a 30-40 degree difference between outside day and night temperatures. The room is on the top floor, west side of the house, so it gets baked by the sun most of the day, meaning it can get pretty warm in there. There is AC in the room, but I try to only run it when absolutely necessary.
Plant Condition: It does not have any soft, mushy spots on the stems or branches. The leaves that fall off are plump and firm. They appear to only be falling from the main stem, not the branches. The whole plant seems like a lighter pale green than most pictures online. There are two individual leaves that have shriveled and turned crispy brown, but no other leaves are shrunken, wrinkled, leathery, etc. Two of the branches had started to produce new growth, but the leaf buds dried up and fell off when they were still minuscule. The other branch still has healthy new little leaf buds. Aside from still wanting to lean over, the stem feels secure in the soil, not loose. There is a strange indented scar at the base of one of the branches where it meets the main stem. (The third picture shows the shriveled leaf and the scar at the base of the branch) I have not seen any sign of bugs.
Sorry for the really long note! I just wanted to provide all the information I could think of. Please let me know if you have any ideas of why it might be dropping leaves. Thank you!