Tip of the Week — 3/23/09

Posted in Gardening Tips, Learning Experiences on March 23 2009, by Sonia Uyterhoeven

Larger than Life Space Savers: Growing Miniature Orchids in the Home

Sonia Uyterhoeven is Gardener for Public Education at The New York Botanical Garden.

If you have been visiting the Garden over the past few weeks and enjoying The Orchid Show, once you get into Shop in the Garden to “do some damage” you will be surrounded by many sweet smelling and wonderful hybrids that stretch upward to 4 feet and beyond with wonderful exotic sprays of flowers (Brassia, Oncidium, Ondontoglossum, and more).

If you don’t have space in your home for these gorgeous giants, there are many attractive miniature alternatives that are ideal for orchid growers of different experience levels, from beginner to advance.

We always think that bigger is better, but often in the confined quarters of our homes this is not the case. When you are thinking of growing plants on a windowsill or table, a diminutive-size plant not only does a better job of fitting the space but ends up creating a greater impact. Here are a few suggestions.

For several years now, the clone or cultivar Oncidium ‘Twinkle’ has been all the rage. To tell you that it is fragrant is an understatement. It exudes a strong, spicy vanilla fragrance that fills the air. This small orchid grows to about 12 inches tall with a full spray of white flowers. It is a cross between Oncidium cheirophorum and Oncidium ornithorynchum. There are a number of clones on the market, Oncidium ‘Twinkle Sharry Baby’ looks and smells like its larger parent (a scent of chocolate) but only reaches 6 inches tall.

Like other “dancing ladies,” these little orchids do well in medium to high levels of light. They will thrive in a southern or western exposure as long as the temperatures do not get too warm or the air too dry. One common mistake that people make with these orchids is overwatering. Miniature orchids grow in smaller pots that dry out faster and often need more frequent watering than orchids in larger pots. Remember, however, that many of the same rules apply. Oncidium like to approach dryness between watering; ‘Twinkle’, with its tiny roots, is no exception.

Encyclia have big, round pseudobulbs (swollen stems that hold water), which tells you right away that this orchid likes to get dry in between watering. This is an ideal orchid for the beginner who has bright light. Encyclia like intermediate to warm temperatures (average household temperatures) and are more forgiving of low humidity levels in the home.

Dendrochilum is a cool-looking orchid—the tiny flowers run down the spike to form a chain. This attribute is augmented by a sweet fragrance. They do well in a 3- to 6-inch pot with a fine fir bark mix or sphagnum moss. Water when the mix starts to dry and fertilize lightly on a regular basis. This orchid is happy with household temperatures and moderately bright light.

Cochleanthes and Masdevallia are good small choices for the more experienced orchid grower. Cochleanthes amazonica thrive in low levels of light (eastern or bright northern exposure) and intermediate temperatures. This orchid likes high levels of humidity (up to 70 percent), so it might be a good candidate for the aquarium or an enclosed case. The reward is a big flower on a small plant.

Masdevallia is known for its intoxicating, colorful blooms. It demands a relatively cool and humid environment to survive. These orchids do not posses a storage system, so they should not dry out. New Zealand sphagnum moss makes an excellent choice for potting media. A regular feed of a diluted fertilizer will keep this orchid healthy and flowering.