Paph Loosing Leaves

[Alan Sailer]

This is my first paph so I am nervous about it. It is a cross of Lorraines Pride and Sibling, the mottled leaf type.

I have had it for about three months. It initially had three leaves. I keep it inside hear a frosted window facing NE. Water is RO or RO with fertilizer. As per the grower, I let it sit in about 1/4 inch of water.

It has been doing great, going from three to six leaves. It budded about a month ago and was doing very well. The bud is bout three inches high at this time and may bloom in a few weeks.

The worry is that three leaves have yellowed and will fall off soon. I don't know if this is natural in a blooming paph but it is alarming.

Any comments?

Cheers.

[estación seca]

Are the leaves yellowing from the bottom up, or are upper leaves yellowing?

What is the potting medium? I keep my Paphs moist but do not stand them in water. However, that probably works with large chunks of medium.

Paphs and Phals are fine with most tap water. I don't use collected rain nor RO on them, saving it for other orchids.

[Roberta]

A photo would help. Paphs do shed the leaves of old growths as the new ones develop. But without a photo, can't tell if that the situation or something else is going on. Personally, I would not let a Paph sit in water. (Phrags, yes... but while Paphs need to stay damp, don't want to be soggy). What are your temperatures? What is the medium?

[Alan Sailer]

Attached is a snapshot. The potting medium is unknown, it was purchased earlier this year from a local professional grower.

Temperature is indoor 73-65F. Water is RO with Orchid Pro 7-8-6 1/4t.gallon every third watering.

The sitting in 1/4 inch of water was per the recommendation of the grower. Subsequent research has indicated this may be too much. In defense of her advice the thing was thriving, doubling in size over the course of months.

Cheers.

[Roberta]

Originally Posted by Alan Sailer

Attached is a snapshot. The potting medium is unknown, it was purchased earlier this year from a local professional grower.

Temperature is indoor 73-65F. Water is RO with Orchid Pro 7-8-6 1/4t.gallon every third watering.

The sitting in 1/4 inch of water was per the recommendation of the grower. Subsequent research has indicated this may be too much. In defense of her advice the thing was thriving, doubling in size over the course of months.

Cheers.

Where do you live? TEmperature, humidity can make a difference in "how much water". The top of the medium looks pretty coarse, so the bit of water to sit in may be correct for the combination. I pot Paphs in small bark, which is water-retentive, so then sitting in water would not be so great.

The leaf-yellowing looks normal to me - once that growth blooms, the rest of the leaves will eventually yellow and drop, but by that time you should see a new growth emerging. Paphs only bloom from a given growth once, so once that has been accomplished, the energy goes to new growth.

One thing to keep in mind... after this bloom, it could be 2 or 3 years before you see another. Also normal. Paphs tend to do a new growth as they bloom on the old, then put down roots (which can take another year) and then bloom once both the growth and roots are mature (likely another year) Once this bloom is done, you should repot - because they stay on the wet side, the medium for Paphs tends to break down pretty fast (like a year or two) so they need more frequent repotting than a Catt or Phal in medium that dries out more between waterings.

[Alan Sailer]

The top of the medium is small rock. Unsure about the rest as I would have to depot it.

The location is Southern California, Camarillo. It's inside with day/night 73/66F right now.

Interesting information. So the first growth will die off completely? But not before a new growth starts?

Are paphs monopodial or sympodial?

Thanks for the answers.

I've had great success with other orchids but this is my first paph. I doubt that they are my future, but tending to this one has been interesting.

Cheers.

[Roberta]

Originally Posted by Alan Sailer

The top of the medium is small rock. Unsure about the rest as I would have to depot it.

The location is Southern California, Camarillo. It's inside with day/night 73/66F right now.

Interesting information. So the first growth will die off completely? But not before a new growth starts?

Are paphs monopodial or sympodial?

Thanks for the answers.

I've had great success with other orchids but this is my first paph. I doubt that they are my future, but tending to this one has been interesting.

Cheers.

Once it has done its blooming (no rush...) you'll be unpotting it at any rate. I'm sure that it could use that...

A note here... Paph roots look completely different than those of other orchids. Brown and fuzzy is a good root! So when you repot, don't go cutting roots, and handle with care, they tend to be brittle and you don't want good roots breaking off in your hand. Just rinse off gently under the faucet and add new medium.

Right, the old growth will die off but hopefully the new one will be well on its way before that - the new growth will be using the root system of the old one for a year or so until it develops its own.

Indoors is fine... this type of Paph (Maudiae type) grows under Phalaenopsis conditions, warm and shady. There are other Paphs that would do fine outside (even in winter) where you live (like the "bulldog" types, or anything with dominant Paph insigne or villosum)

Paphs are sympodial - new growths appear along a rhizome/stolon rather than from a central growth point. When happy, they can put out multiple new growths, forming a clump. Once there are multiple growths, with several at different stages, it blooms more frequently. But it's a pretty slow process.

[Alan Sailer]

Roberta,

Thanks so much. I was planning to repot after the bloom and it will be interesting to see the roots. If you have any ideas for a good medium for indoor use please advise. Ideally it would allow watering on a weekly basis, perhaps more in winter when heating lowers humidity.

By the way, I have spent some productive time at your website, thanks for the work at putting it up.

Cheers.

[Roberta]

Originally Posted by Alan Sailer

Roberta,

Thanks so much. I was planning to repot after the bloom and it will be interesting to see the roots. If you have any ideas for a good medium for indoor use please advise. Ideally it would allow watering on a weekly basis, perhaps more in winter when heating lowers humidity.

By the way, I have spent some productive time at your website, thanks for the work at putting it up.

Cheers.

Thanks! Glad you enjoyed!

For Paphs, I use the small ("Classic") Orchiata bark. Rexius works OK too. (but if you use that, wear gloves, it has splinters) In a pinch, you can use plain old seedling bark of the sort that is used for Cymbidiums, but it will break down faster. Once a week is likely not enough - better to have good drainage and water more often. Others on the Board use the semi-hydroponic approach with good results. I can't advise there since I don't use it.

[estación seca]

Paphs are monocarpic like Agave. They produce new offsets either before or after flowering. The growth that flowered will eventually die after flowering.

You're providing next to no fertilizer, and it will harm the plant long term. Read some in the Paph forum here about fertilizing. The flower on your plant may have formed before you bought it.