I bought a cactus last week. When i purchased it, it was totally green (light green) in colour. From the next day onwards I've been noticing that the spikes
are increasingly becoming brown. except for this the plant is healthy. no other issues. Is this normal, or is something wrong? I forgot to mention that when i bought it, the soil in which it was planted was quite moist. I felt it had more moisture content than is good for the plant. what should i do?