Overall, zz plants are a slow growing. If so, your ZZ plant may have suffered from root rot. Remove the ZZ plant with yellowing leaves from its pot to rescue it. It is a plant with tuberous rhizomes, so the stems are under the soil like potatoes and Dahlias (they look very like Dahlia tubers actually, just with much fatter succulent roots). I save the healthy stems and this tiny bulb. When a plant is root bounded, it doesn’t have enough space to expand its roots. Plus it makes for a lovely decorative foliage arrangement while you wait for it to root! Remove any rotten roots and pot it up into a pot that is appropriate for the size of the root ball. I used a planting mixture of 3/4 potting soil with 1/4 succulent and cactus mix.A few handfuls of compost were tossed in along the way as well as a 1″ layer of worm compost towards the top. They do just fine in a small pot. ZZ — shorthand for the plant’s tongue-tangling botanical name, Zamioculcas zamiifolia — may be the solution for anyone who wishes they could grow something — anything — without much attention and hassle, and better still if it can thrive on neglect. But if you do want to repot your zz plant, just plop them in a larger pot and prune the roots a bit to avoid them getting root-bound. The ZZ plant is easy to root from a simple cutting placed in water. And I also took the liberty to remove all the rotted or rotting roots. ZZ plant stems can also fall over due to light problems, severe under-watering, lack of or excessive fertilizer, cold stress, transplant stress or trauma. I poked the soil of my ZZ raven today, I found out that 3 of the 4 root bulbs has rotten. zz plant root bulb rot Early morning, or late afternoon sun is acceptable, therefore try to aim for a North, East or West facing window. They can get up to 3′ tall indoors, which is actually much taller than they get in their natural habitat. I did find this article which debunks myths and explains the Zamioculcas zamiifolia is a plant from east Africa growing not in deserts, but in shady forested areas. ZZ plant stalks most commonly droop or fall over due to overwatering, which leads to root rot. The zamioculcas zamiifolia plant (ZZ plant for short) is a great choice for those who are new to gardening, caring for houseplants, or have an all-around brown thumb. These bulbs are known as rhizomes. And I washed the roots to get rid of the bad soil with possible bacteria from root rot. Promptly take it out of its pot and repot it. This plant is one of my top 5 favorite easy-to-propagate plants which I shared recently. Repot the ZZ plant in a bigger pot to prevent further damage. Now this is what is left of it: What should I do? 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