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Setter 08-17-2021 03:32 PM

Phal leaf issue
1 Attachment(s)
Several of my Phalaenopsis have leaves that look like the attached picture. I grow in semi Hydro, the day temperature around 85° night temperature around 70°, good airflow and humidity around 65%. Does this look like a nutrient deficiency?

estación seca 08-17-2021 03:49 PM

What water are you using? What fertilizer? How often?

Setter 08-17-2021 06:12 PM

RO water. MSU K-lite fertilizer, filing reservoir every week.

Ray 08-17-2021 06:17 PM


Originally Posted by Setter (Post 965232)
RO water. MSU K-lite fertilizer, filing reservoir every week.

K-Lite at what concentration?

Filling only, or flushing to refill?

Setter 08-17-2021 06:38 PM

1\8 tp per gal. I don't flush each time I water. I do water until water runs out the 2 holes at each watering. I do a complete flush, water to the top and drain out the holes, once a month.

Ray 08-18-2021 09:19 AM

1) I suspect you’re under-feeding. 25 ppm N is fine, but my plants in S/H culture get that 2 or 3 times a week.

2) When you water, you should always fill the pot rapidly to the top and let it drain down to the holes, as that flushes residues, wets the medium, and refreshes the chemistry of the reservoir. Doing so precludes the need for your monthly plain-water flush, too.

By merely topping it up, you’re letting the plant sit in a combination of fresh solution and it’s own wastes.

Setter 08-18-2021 04:15 PM

Thank You!

estación seca 08-19-2021 12:50 AM

I'm suspecting a magnesium or iron deficiency if you've been feeding it that sparsely. Mg is a constituent of the chlorophyll molecule, and Fe is necessary for its synthesis. You can add a half teaspoon of Epsom salts to your mixture along with the Klite for the Mg. It can take months to give enough Mg to a deficient plant.

Look for a water-soluble iron supplement and add a tiny amount.

You don't need to use R/O water for most Phals. Where do you live? Using tap water is fine for Phals in most of the US, and you will not need to worry much about mineral deficiencies.

Setter 09-18-2021 03:24 PM

I live in Northern Nevada. We are on well water. The TDS is 168. The ph is about 7.7. Is this water ok to use on my Phalaenopsis in SH?

estación seca 09-18-2021 04:59 PM

I dream of having tap water with TDS that low. You can use it on most orchids other than cloud forest species. Check the pH after mixing your fertilizer. You can get a pH test kit at an aquarium shop or swimming pool supply. You are aiming for pH around 5.5-6.5.

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