Preface: The following instructions are not meant to be a scientific treatise on Clivia. There are many great Academics who have written far more on the subject and in much greater depth. If you want to know more technical information or make a study we recommend that you seek out other experts and publications.
We have merely written this section to assist our Customers using simple and straight forward language and instruction.
Thank you for understanding our mission.
This section is primarily for the Clivia Grower who maintains his or her collection in a set of pots.
Before we begin, keep in mind that in warmer parts of the world Clivia can be grown on sides of buildings, in forests or under shade cloth providing approximately 80% of the light is diffused away from the plant. Hard or compacted soils are taboo.
1. Pot Use
Clivia tend to like growing deep into a pot. Once they have grown to seedling size we transplant them from our trays to our clivia pots These should last you until the roots start growing out through the bottom of the pot. We then keep them in 6" deep pots. Once they grow 8-10 leaves we use 8-10" pots depending on the size of the root ball. Clivia like to be pot bound. Do not repot until the root ball fills the pot, and then only repot into the next largest size pot. (Maybe 2" more in diameter)
If your plant won't fit into a pot-either trim back the roots or use a larger pot. Remember if trimming the roots, apply a fungicide paste (50% fungicide-50% rooting hormone) and do not water for several days allowing the roots to "heal".
2. Potting Mix
We use a light, airy mix purchasable here that allows water penetration and excellent drainage.
You also want some organic matter in your mix as there are benefits as it breaks down.
Because of these considerations our own mix (highly recommended for your success-you can make it) is composed of:
20% medium coconut chips; 30% fine coconut chips; 10% composted vegetative material only No Manure of any kind.; 20% coarse perlite (sponge rock); 10% agricultural charcoal or Hygroton clay pellets; 10% new zealand (or equal) sphagnum moss. The percentages are estimates. Anything close will do.
Sometimes we will try different materials, or something might get potted in one of my orchid mixes, which has, Clamshells, Lava Rock, sharp builder's sand, and other items in it depending on plant type.
Over time I have come to use a medium cement mixer tray found in places like Lumber yards, Home Depot etc. for a mixing and holding container.
Keep your mix dry. Only water after potting up.
Clivia readily accept a PH of neutral (7.0) to slightly acid 6-6.9. Unless you have hard alkaline water I wouldn't pay too much attention to PH.
Many people kill both fish and plants by making adjustments to PH too quickly. Make changes slowly over several weeks if you must... and buy a good PH meter-no guessing!
4. Watering (Or how most people kill their plants)
I use a very simple water system. First of all during the late spring, summer and 1/2 way through the winter, I use any 20-20-20 soluable fertilizer I can buy at a reasonable price. (You can use almost any fertilizer as long as the numbers added up =60)
(Note, we have a product my son affectionally calls Barry's Special Sauce. We have only recently begun making it as a sale item. Use it once per month in the place of one of the fertilizations. Our plants grow really much faster with our mixture.) Everything any houseplant may need is in the "Sauce"
Once during April I use a fertilizer lower in nitrogen and higher in Potassium and the Phosphates to promote flower growth. See Jack's Feertilizer for example-this is a substitution for the 20-20-20 not in addition.
For three weeks we use 1/4 teaspoon of fertilizer per gallon of water (Or 2 weeks Fertilizer, 1 week Sauce, 1 week water only). I make sure the pots drain. No standing water, please.
This procedure is carried out whether watering by hand or using sophisticated dosing systems.
On the fourth week we use only water and nothing else and fully flush any salts out of the plant. (again no standing water left in pot, please).
In Late Winter/Early Spring change your fertilizer over to any good one that has its second number, at least, twice as high as the first. This action will stimulate larger flowers, flower counts and bigger Umbels. Do this until late spring.
If you really want your adult plants to bloom you'll let them dry out from early winter to a point 2-3 months later. Give them a little drink of water monthly. Not much, just make sure they are staying turbid (not drooping over)
Remember if in doubt don't fertilize..
4. The cold Period
In order to stimulate your Clivia to both bloom and especially to encourage growth of tall Umbels (Balls of flowers), you must give them a little winter chill. We place our adults into an area that in general remains at 45-60 during a winter day and drops no lower than 40 degrees fahrenheit at night.
Some enthusiasts use higher numbers but we are simply trying to expose what we do to our valued customers.
Covered for the most part under watering as water is the vehicle used for the soluable fertilizers.
We should mention that we use a solution of Cal-Mag once each month when the plants are in growth. Generally from March to October here in the Northeast. We use the instructions on the can whatever they may be. (You only need this if not using "Barry's Special Sauce".)
By using the Cal-Mag supplement we are just assuring ourselves that we are not missing any ingredients our beautiful plants may require.
I Read on Dudeknowstuff.com that I should use Bat Ear Wax for a media. Why should I use your method?
We have nothing invested in you using our methodology. It works for us. If you want to use regular dirt, potting soil, bat ear wax, etc for your media go for it. Adult Clivia are TOUGH so they will survive your choices most likely.
Just understand theres a difference between survive and thrive, and that difference is sometimes dramatic.
For example this is an offset of Conway's Hannah we bought from someone in California who plants in dirt. The plant came in and was a nice healthy strap leaf plant.
Only one thing, after a few months here we learned it was not supposed to be strap leaved at all. It had been putting all its strength into survival. Yes the leaves pointed at with the arrows are on the same plant.
From the 2nd pic you can see how its gone from strap leaf to a slightly broader leaf to a severely broader leaf as its grown here. This is the result of a better soil-less mix and the higher fertilization that mix allows us to utilize. This plant is just sitting in our front foyer in our home which we use as an auxiliary cold room. Its getting no special treatment or extra light. (unless you think getting its picture taken near my bare feet and oh so sexy sweatpants is special treatment.)
Other info that is not at all related to this article: If you ever need a picture of dead rust on a clivia you can go ahead and use the leaf in the top of the photo too. Our personal plants got hit by a hailstorm this summer so we are pretty happy to have gotten away with just a little rust and scarring. Some people might cut that off or remove the leaf but we feel that if the leaf is still generating energy for the plant and not contagious theres no reason to remove it.