Some orchids will grow larger and larger leaves when they are happy. The oldest leaves should be the smallest ones. If a Phal starts to grow smaller leaves then its not happy. Its not uncommon for flower shops that sell all kinds of plants to neglect the needs of the plants cause they know they will likely be sold before the plants begin to show the negative effects. For this reason i also look to the conditions of the store, the lighting, the placement of the plant, touch the dirt, the leaves of the plant, peek in the back to see if they have a pile of dead plants.
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