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Phals: Pot Size Versus Leaf Span

The bottom flat of 2.5" pots is an example of recently repotted Phals.  Most Phals come out of compot (community pots) and the smaller plants go into this size pot while the larger ones go directly into 4" pots.  The top flat of 2.5" pots is an example of a flat approximately 8 to 10 months after planting and just before they are transplanted again into larger pots.  The smaller plants will go into 4" pots and the larger ones may skip directly into five inch pots, depending on the leaf span and root growth.

In general, when they are first planted in it, the plants have leaf spans that are close to twice the size of the pot, give or take an inch or two.  But even that is not a reliable guide.  The leaf spans of standard adult or near adult Phals may reach 18 to 24 inches and still require a 5 inch pot to keep the root system from being "over-potted" and therefore prone to stay damp over long which promotes root rot problems.  Miniature or compact growing "sweetheart" types may never outgrow a 4" pot and still be blooming size adult plants.  Miniatures may actually bloom for the first time in 2.5 inch pots with leaf spans under 5 inches.  Phalaenopsis equestris hybrids often do this and then go on to be much larger plants.

The list below attempts to correspond leaf spans with pot sizes because this topic generates so many email questions.  Keep in mind that leaf span measures from leaf tip to leaf tip and is not a measurement of each leaf.  Keep in mind that seedlings grow and as the above picture demonstrates sometimes pretty fast.  Also keep in mind that this list is a big generalization and not a guarantee.  When you order, you are always welcome to ask for the current leaf span of the plants I plan to ship or the ultimate size a plant is expected to reach.  I usually ship the largest plants I have of a particular group and sometimes think to warn people on my own when something is smaller than the basic sizes listed below before I ship.

A 2.5" pot mini-compot is planted with seedlings whose leaf spans begin at about 2.5 to 3 inches but may reach 5 to 7 inches before I get around to repotting them into larger pots.
2.5" pots have plants whose leaf spans begin at about 4 inches when first planted.
4" pots have leaf spans that begin at about 6 to 8 inches when planted.  Some Phals may bloom for the first time in this size pot within about a year.
5" pots generally start with plants at 6 to 9 inches leaf spans.  These are blooming size or near blooming size plants and many or even most will bloom during the next flowering season.
6" pots generally have plants with leaf spans anywhere from 10 inches and larger.  These may or may not be previously bloomed plants but all are blooming size. "Blooming Size" means the plant is the size when most of it's kind bloom.  Of course, culture and genetics play a large role in deciding when and if a plant ever achieves anthesis, and I make no promises.  Previously bloomed plants have not been culled for quality.  I am not an orchid judge.  I do however toss out any which show deformities, if  I see them bloom before you do.  And I occasionally set one aside to use as a pollen or capsule parent in my own breeding program if it shows traits I like.

This image is from the orchid collection at
Al's Orchid Greenhouse