I love Clivias, but recently yellow and black worms destroyed all my plants. Which insect killers can I use and how frequently must I use them?
Various types of worms can affect garden plants. Those that cannot be picked off can be treated with products containing Bacillus thuringiensis (Bt), a natural bacteria that kill worms without harming plants. Neem oil may be helpful as well. Here is more information: https://www.gardeningknowhow.com/plant-problems/pests/prevent-caterpillars.htm
https://www.gardeningknowhow.com/plant-problems/pests/using-bacillus-thuringiensis.htm
https://www.gardeningknowhow.com/problems/pests/neem-oil-uses.htm
I live in So. Calif. I have several potted clivias and I wonder when should I fertilize them? What kind of fertilizer? One plant has a flower right now. Is it too late to fertilize it? Your answers would be very helpful. My best, Mira
When the plant begins it's new growth in the spring you can resume it's once a month feeding schedule.
Use a balanced all purpose fertilizer, water soluble. I recommend half strength in containers.
Look for the numbers 12-12-12.
https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-plant.htm
Is your advice for northern or southern hemisphere?
Many people grow Clivia as an indoor houseplant.
Clivia are hardy in zone 9-11.
The suggested dormancy period in the article would be correct for the Northern Hemisphere.
https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-plant.htm
I live on Vancouver Island. I've had a Clivia growing indoors in a pot for many years and, except for the first 2 years, it has never since bloomed and the ends of the leaves go brown. I've been told the plant likes to be root bound, but I did split it up early this spring. I think it was too rootbound 'cause there was very little soil left in the pot. Both plants seem to be doing well, but I still have the brown leaf tip problem. Any suggestions?
Brown leaf tips are often the result of root problems, as you've guessed. It may take a while for the plant to recover. Here are more details:
https://www.gardeningknowhow.com/plant-problems/environmental/what-causes-brown-edges-on-leaves-of-plant.htm
Clivia can be challenging plants. You could try the procedure in this article to force blooming, if you have not already:
https://www.gardeningknowhow.com/ornamental/flowers/clivia/getting-clivias-to-rebloom.htm
Can you grow Yellow Clivias from seed and how to plant the seed?
Yes, you can grow Clivia from seed. Here is how to collect and germinate them:
https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-seed-germination.htm
The greenhouse at the retirement home I work at has a BAD scale infestation. My plant skills are just blossoming but I'm trying to do all I can to help it. However, I brought a Clivia home from work last week. It doesn't look to have an infestation but I did see 1 or 2 small scale bugs present. I picked those off and sprayed with watered down dish soap. Should I be doing anything else to prevent infestation in my home? Or should I just get rid of the Clivia to be on the safe side. (I don't want to do this as I really love it).
I would certainly isolate your Clivia plant from the other plants in your house, since Scale can rapidly move from plant to plant.
Treat the plant with Neem Oil if the homemade insecticide is not clearing up the problem.
Neem Oil is also organic and safe for people and pets!
Here are some links to help you.
https://www.gardeningknowhow.com/plant-problems/pests/insects/control-plant-scale.htm
https://www.gardeningknowhow.com/plant-problems/pests/pesticides/neem-oil-uses.htm
https://www.gardeningknowhow.com/ornamental/flowers/clivia/clivia-plant.htm
One of the leaves on my clivia is turning yellow with red "sores." What am I doing wrong?
This could be caused by a rust fungus:
https://ask.extension.org/questions/227470
Also see this article:
https://www.gardeningknowhow.com/plant-problems/environmental/plant-leaves-turn-yellow.htm