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Thread: Brassidium Yellow Star - Yellowing Leaves

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  1. #1
    Join Date
    Jul 2018
    Gender
    Female
    Location
    East Greenbush, New York
    Posts
    7

    Question Brassidium Yellow Star - Yellowing Leaves

    Hello!

    Iíve had this Brassidium Yellow Star ĎGolden Gambolí for about a year and its been doing quite well up until a couple of weeks ago. I noticed that a couple of its leaves have started browning at the tips and eventually start turning yellow. One of these leaves is on the side of the pseudo bulb so no big deal, but the other yellowing leaves are on the tops of the two newest bulbs and Iím wondering whatís going on...

    I have the plant in an east facing window with a couple other oncidium types and a few phals. Itís in a 4 in clay pot in bark (RePotMeís All purpose orchid bark mix) on a humidity tray and it gets watered once a week. I water with RO water, but our RO system has a second set of filters that supposedly adds some minerals back in so it doesnít taste so weird. I donít know if that actually works, but the TDS reading is about 16 ppm. I donít PH test but maybe I should? I fertilize when I remember about once or twice a month with MSU formula full strength.

    Iím in upstate New York, so it gets a bit nippy this time of year. We keep our house on the cooler side in the winter, 68 day temps and 62 night temps. The plant is right up next the the window so itís likely even cooler than the ambient room temps. Could the temps be the source of the leaf drop? What do you all think?

    Any ideas are appreciated! Thanks!

  2. #2
    Real Name
    Ray Barkalow
    My Grow Area
    Porch/Patio.
    Join Date
    Oct 2012
    Location
    Oak Island NC
    Posts
    1,920

    Default

    A photo would be a great help.

    What is "full strength" MSU, and which formula? When was it last repotted? Have you checked the condition of the root system?

  3. #3
    Join Date
    Jul 2018
    Gender
    Female
    Location
    East Greenbush, New York
    Posts
    7

    Default

    I use 1oz/gal of the RO/Rainwater MSU formula.

    It was repoted last February. Since itís in clay I canít see the roots well so I have not checked since Iíd have to unpot it. I was waiting to hear if there were obvious temp requirements. The few aerial roots it has are plump (and really thick for an omcidium type! Weird.) and its psuedobulbs arenít shriveled at all so I donít think itís dehydrated.

  4. #4
    Real Name
    Ray Barkalow
    My Grow Area
    Porch/Patio.
    Join Date
    Oct 2012
    Location
    Oak Island NC
    Posts
    1,920

    Default

    I assume that's the liquid stuff sold by Re***Me.com, so that tells me you applied 125 ppm N monthly. That's not likely to do any damage, and you're right, if the pseudobulbs are plump, roots are not likely the issue.

    That "flavor enhancement" cartridge on your RO system is likely full of calcite, adding calcium, which is fine.

    Yes, being too cold could definitely be an issue, and it might be exacerbated by evaporative cooling of the root system if your house has a low RH.

    As a general comment, it would recommend that you feed 1/4 of that amount weekly, rather than doing so only monthly, and consider adding a teaspoon of Epsom Salts per gallon once a month.

    Also, don't buy the liquid fertilizer in the future. It's very expensive, costs a lot to ship (you're paying for water), and as they are merely dissolving a pound of the powder per gallon of water, chances are that some of it drops out of solution over time, so you're not giving your plant the complete nutrition provided in the first place.

  5. #5
    Join Date
    Jul 2018
    Gender
    Female
    Location
    East Greenbush, New York
    Posts
    7

    Default

    Our humidity is super low. I didnít even consider that might be making it feel colder but it totally makes sense! Iím going to try moving a bunch of my plants on to a seedling heat mat and see if that helps any. Unfortunately, Iím probably not going to be able to convince the hubby to turn up the heat much. cost of oil and all that...

    Thatís an interesting thought on the liquid vs. powder fert. Iíll go for the granular stuff next time...itís probably much easier to measure as well.

    Thanks Ray!

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