As mentioned in our introduction, cacti plants can turn brown for many reasons.
37+ Cactus Turning Brown On Top. (we rarely have cold days here and it's started to get cold this week) or because of other thing??? Severe burns show up as hard brown scars on the burned surface.
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It may sound ironic because we think of cacti as however, if the cactus is turning yellow from the bottom instead of the top, it usually is more serious. Well, it doesn't look good. Department of agriculture plant hardiness zones 3b through 11, depending on species when your indoor cactus begins to brown and dry out appreciably, you should check that it isn't located near a heating vent.
Severe burns show up as hard brown scars on the burned surface.
I'm guessing that your euphorbia could be just missing its top spines because it has gotten bumped into something which would also explain the big scar on its side. Here is a picture i think the brown stuff at the bottom might be corking which is a natural process on cacti, esp the taller ones. Indoor cacti are more prone to this than their brethren who get. For instance, if your plant is turning brown from the top, the cause could be sunburn.
