My Alocasia Corm Rotted During Propagation. Why?
1. It dried out: Do not let your corms dry out for an extended period of time if you’re trying to get them to grow roots and shoots. They will shrivel like a prune and that will be the end of it. Game over. Whatever method you are using for propagation, make sure the moisture is consistent the entire time. If you are propagating in Fluval Stratum or moss or in a puddle of water: DO NOT LET IT DRY OUT COMPLETELY.
2. The substrate didn’t have enough air: I am starting to see people calling the act of opening a propagation container to let fresh air in “burping” your prop on social media, and I don’t know if I hate it or love it…but it cracked me up. Oxygen helps roots to grow through a process called respiration, and also creates an “aerobic” environment in the substrate that you’re using which prevents your corm from rotting! I’m not quite sure if frequent “burping”/ letting fresh air into your propagation is ultra necessary to be honest (because i hardly do it and my corms grow just fine), but what is necessary is that your substrate is well oxygenated during the sprouting process. This being said, if you are using a closed container and it is starting to have a ton of condensation or mold or algae build up you will want to open it for sure and wipe it down.
Allowing air into the SUBSTRATE means:
- If using the puddle method of propagating in a little puddle water, you don’t want the water to get stagnant.Change the water every once in a while to fresh water (which will have refreshed O2 in it). I am not a fan of the puddle method because it’s a pain in the ass to have to watch the water levels in case it dries out and monitor it for becoming stagnant. I like to set-it-and-forget-it when propagating!
- If propagating in sphagnum moss, keep it light and fluffy and only as wet as a wrung-out sponge
- If propagating in fluval stratum or perlite you are set as air pockets are naturally built into the spaces between the granules.
3. Your hands were dirty: It’s possible you didn’t clean your hands before planting and accidentally contaminated the substrate and corm surface. Best practice: spray your hands with rubbing alcohol before handling corms or wash your hands with soap and water. If you drop your corms somewhere and you want to be extra cautious about cleaning them off, you can soak them first for at least 15 minutes in a solution of 1 part hydrogen peroxide to two parts water to clean them off a bit (this is not something I do as standard practice however).
4. You didn’t peel: You did not peel the outer (brown) layer of your corms first before planting. Peeling your corms isn’t 100% necessary, but speeds up the rooting process tremendously and does not hurt the corm AT ALL when done with a clean plastic plant tag, credit card or finger nail. The faster the corm produces roots, the quicker it will begin to take up water on its own and become a self-sufficient plant (as opposed to just an underground plant storage structure) and less of a chance it will rot as a lonely underground storage nugget.
5. You planted upside down: It happens to the best of us. Just remember: the pointiest part to the sky, ideally JUST the tiny tip sticking out of the substrate. Where the stolon came from goes down to the ground.
6. You got a bad corm: Sometimes this just happens! Survival of the fittest. Not all seeds were meant to sprout. Nature is cruel and beautiful. Try again with another!
7. You didn’t read my award winning book, The Ultimate Guide to Houseplant Propagation which teaches you how to grow Alocasias from corm step-by-step as well as how to rehab struggling plants. You can buy a signed copy from me here, or check it out on amazon.com !
