One teaspoon per gallon of fertilizer!
User Name

Registration is FREE. Click to become a member of OrchidBoard community
(You're NOT logged in)

menu menu

Donate Now
and become
Forum Supporter.

One teaspoon per gallon of fertilizer!
Many perks!



Fauna Top Sites
Old 01-21-2023, 01:23 AM
My Green Pets's Avatar
My Green Pets My Green Pets is offline
Senior Member

Join Date: Jul 2013
Location: Colorado
Age: 42
Posts: 2,470

My Catasetinae have received two AOS awards, one an AM and the other an HCC. I use K-Lite 12-1-1 at 1/4 tsp/gal with every watering. Once a month I might switch it out for Alaska Fish Fertilizer 5-1-1 at closer to 1 teaspoon per gallon.
My plants are potted in sphagnum which I assume holds on to the fertilizer like a sponge. I might experiment with using more ferts, but things are growing well under these conditions.
William Green
Reply With Quote
Old 01-21-2023, 09:49 AM
Ray's Avatar
Ray Ray is offline
Senior Member

Join Date: May 2005
Member of:AOS
Location: Oak Island NC
Posts: 14,140
One teaspoon per gallon of fertilizer! Male

I am “iffy” on slow-release fertilizer. I’ll admit some of that is due to my frustration with knowing how much to use.

Most people just guess or use the recommendation of the manufacturer, but that is intended for use in soils. I suppose it can be calculated:

If I use the “10 mg N” retained figure from my earlier ramblings as a weekly goal, and we have a 9-month slow release formula that is 20% N, then we need the stuff to release a total of (39 weeks x 10) 390 mg N. 390/0.2=1950 mg, so let’s just say 2 grams of pellets should be used per pot.

Then, there’s the temperature factor. That “9-month” release occurs at 70F. If the temperature (average) is different, the rate of release is changed roughly 3 days per degree. Over winter, my indoor growing temp averages right about 70, but when I move them outside, that average can be 10-15 degrees higher, so the pellets will dump their contents more quickly.

Then there’s that “exposure” issue again. Some media wick well, while others don’t, and if you’re one to allow it to dry considerably, it will take the pellets being very close to the roots for them to contribute anything to the plant.

Pot size is part of the exposure factor, too. 2 grams evenly dispersed in a 4” pot are closer together than 2 g dispersed in a 6”pot, so one would expect the plant in the 4” pot to get more of it. And that assumes identical root systems that meander throughout the potting medium.

So does that mean a phalaenopsis in a 6” pot, with 8, 9” x 1/4” roots will take up less nutrition than will an oncidium colony in a 6” pot having 50, 9” x 1/8” roots?

I’ve heard of folks top-dressing pots with the pellets, which probably helps the distribution of the nutrients, but won’t they dry out more quickly, stopping the release?
Ray Barkalow, Orchid Iconoclast
Try Kelpak - you won't be sorry!
Reply With Quote
Old 01-21-2023, 12:21 PM
Roberta's Avatar
Roberta Roberta is offline
Super Moderator

Join Date: Jun 2008
Zone: 10a
Location: Coastal southern California, USA
Posts: 10,579
One teaspoon per gallon of fertilizer! Female

I only use it on orchids that need an extra boost, like Catasetinae and Cymbidiums. They definitely benefit from "more", the "how much" isn't so critical, they can utilize whatever I give them because of their rapid and substantial growth. And it poops out just about when it needs to. So I just put a healthy pinch (or maybe what fits in the palm of my hand for the bigger pots) Not scientific at all. The slow-growing "normal" orchids I would not want to use it, since there's no control and "less" is what they want.
"Extraordinary claims require extraordinary evidence" Carl Sagan

Roberta's Orchids (Visit my back yard)

See what orchid species are blooming in Southern California(New page for February 2023)
Reply With Quote
Old 01-23-2023, 02:04 PM
isurus79's Avatar
isurus79 isurus79 is offline
Senior Member
American Orchid Society Judge

Join Date: Sep 2007
Zone: 8b
Location: San Antonio, Texas
Age: 43
Posts: 9,758

Here's a video I did with Fred where he describes in detail how he fertilizes his Catasetums. His fertilizing regimen changes during the growing season:
Stephen Van Kampen-Lewis

Pics on Flickr


Reply With Quote


fertilizer, growth, month, ppm, watering

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Make a Fertilizer Concentrate to Simplify Dispensing Ray Beginner Discussion 0 07-22-2021 05:47 PM
Does Fertilizer Go Bad (& a couple other ?s) Mountaineer370 Beginner Discussion 40 06-10-2021 02:15 PM
fertilizer confusion Alys Beginner Discussion 33 03-25-2021 04:16 PM
How to Mix Fertilizer IncurablePlantHead Scientific Matters 4 03-16-2014 11:20 AM
organic 8-1-2 fertilizer weez1959 Beginner Discussion 10 02-20-2010 08:58 PM

All times are GMT -4. The time now is 08:41 PM.

© 2007
Search Engine Optimisation provided by DragonByte SEO v2.0.37 (Lite) - vBulletin Mods & Addons Copyright © 2023 DragonByte Technologies Ltd.
Feedback Buttons provided by Advanced Post Thanks / Like (Lite) - vBulletin Mods & Addons Copyright © 2023 DragonByte Technologies Ltd.

Clubs vBulletin Plugins by Drive Thru Online, Inc.