Ask a Question forum→Potting media for Clivias

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Hobart
Ladybugsforever
May 12, 2020 8:03 PM CST
Hi all, I am in Tasmania, Australia, in Winter we get some Max temperatures of around 43 F in the day and down to zero over night but usual winter temps are more like max of 50 to 54 F and down to 35 F overnight. I recently split up my huge Clivia from an enourmous pot and repotted it. First pot up was into two different orchid bark mixes, 50 % a coarse one 50 % a finer one. (I couldn't get a medium one) I then thought they wouldn't get enough water (silly me) and switched all the media to 50 % fine bark mix 50 % cactus and succulent mix. And I also watered them maybe twice (silly move) A few weeks later, yesterday, I upended one to check and some roots have rotted and there is mildew on at least 3 or 4 roots. So I have upended all of them and yup, mildew on at least 4 of them and rotting roots on most, but all still have good healthy roots left. I've removed the rotted roots, cleaned them up, and will either spray with 3% hydrogen peroxide or dust with sulphur. My question to you all is, what to treat the roots with, and what media to use please to avoid further root rot? And does anyone use activated carbon in the bottom of their pots to help absorb excess water? Many thanks from Australia.
Name: Daisy I
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DaisyI
May 12, 2020 10:11 PM CST
I have always potted my Clivia in regular, straight out of the bag potting soil. If your Clivia are rotting, you are probably overwatering. A layer of charcoal won't help.
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WillC
May 13, 2020 9:05 AM CST
If you removed a good portion of the original soil when you repotted it, then your plant is probably reacting to the roots that were damaged in the process. It may take a while for it to recover.

In general, when repotting, it is best to use a potting mix that best matches the mix it has been growing in and the roots have adapted to.
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Name: tarev
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tarev
May 13, 2020 12:44 PM CST
I grow my Clivias like I am growing a typical succulent plant minus the direct sun exposure. They have such fat, spaghetti-like roots that hate sitting in too damp media. So I use a combination of cacti mix, clay rocks, chunky lava rock and pumice.

In late Fall to Winter, I don't water them. I can even place them in our cool garage with no light and they still do fine. But I do try to get them much more colder temperature exposure if possible down to 40F outdoors, weather permitting and preferably if no rain is in forecast in late Fall to winter.. That helps later when it does its mid winter to early Spring bloom formation.
[Last edited by tarev - May 13, 2020 12:44 PM (+)]
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Hobart
Ladybugsforever
Jun 10, 2020 5:03 AM CST
Thank you everybody for your reply's. An update, they are not doing very well. I have since discovered that the cactus and succulent mix had mould in it which may have caused the roots to go mouldy. I think they have all gotten root rot from the mould and damp conditions of the potting mix. I also realise that I cut off too much of their roots and gave them too much of a shock, by not retaining enough original soil around their roots as noted by WillC. Thank you. I will most likely lose the lot. I feel very sad. There is such differing advice on the internet about how to repot clivias up. Good point about potting media tarev thank you. And thank you Daisyl for your advice on the charcoal and the watering.

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