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Spare the pruner and spoil the houseplant?

The truth is that overcrowded plants often look lusher

by Lee Reich
January 27, 2011 12:04 PM | 0 0 comments | 12 12 recommendations | email to a friend | print
Photo by Lee Reich.
Photo by Lee Reich.
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I wonder why my houseplants look so unattractive – at least compared to some other people’s houseplants, like those of my friend Sandy. I was recently awed by the lushness and beauty of her orchid cacti, begonias and ferns. I also grow orchid cacti and ferns, so what’s with mine?

Perhaps the difference is that others’ houseplants have a cozy, overgrown look. Mine don’t. Most of my houseplants get repotted and pruned as needed for best growth. Every year – every two years at most – my houseplants get tipped out of their pots, their roots hacked back, then put back into their pots with new potting soil packed around their roots. In anticipation of lush growth, stems also get pruned to keep the plants from growing top-heavy.

Rather than being scattered willy-nilly throughout the house or clustered cozily in corners, as in Sandy’s house, my houseplants get carefully sited. For best growth, plants, especially flowering and fruiting plants, need abundant light – something that’s at a premium this time of year. So my houseplants huddle near south-facing windows like baby chicks near a heat lamp. And then in summer, when light – even indoors – becomes more adequate and the plants could move a bit back from the windows, I move them all outside so that summer sunlight, rain and breezes can really get them growing.

What can I say? I’m too focused on good growth, and that’s not necessarily what makes for the prettiest houseplant. It’s the difference between a lush plant packed into and overflowing its pot, along with elbow-to-elbow neighbors, versus one that has had its soil refreshed frequently, its stems thinned out and pruned back, always with younger stems raring to grow. I can’t help myself.

Choice of houseplants also comes into play. Houseplants that are prettiest for the longest period of time – and need less light – are those valued for the shapes and colors of their leaves. I gravitate to houseplants with fragrant flowers or fruits – or even better, fragrant flowers and fruits. Pumping out lots of flowers, and especially fruits, demands much more energy from a plant than just growing leaves. And that energy comes from sunlight and young leaves that are efficient at working with that light. Hence the repotting and clustering near sunny windows of my houseplants.

Perhaps it’s also a matter of “the grass is greener,” to me, in Sandy’s house. I’ll start looking at my houseplants more with the eye of an appreciative visitor.

The temperature was nine degrees and we were on our way to go cross-country skiing when my friend Jason asked if there was any benefit to the cold weather (plantwise, that is; we knew that the weather was good for skiing). Interesting question, and the answer is “yes.”

The first benefit that comes to mind is the effect of cold on diseases – certain diseases, at least. The cold kills them. Peach leaf curl, for instance, is a disease that overwinters in peach buds, resulting in leaves that unfold thickened and twisted and eventually yellow and fall, so that fruiting and growth suffer – except in cold winters. Our winters are usually cold enough so that this disease is rarely a problem.

Remember the awful late blight of tomato that went on the rampage here and throughout the Northeast a couple of summers ago? That disease can’t spend the winter this far north because it’s too cold. In that past summer and some other summers, the disease hitchhikes north on infected plants brought here or, when winds and humidity are just right, hopscotches along north from one infected field to the next.

Insect pests that overwinter in the soil are more damaged the colder that the soil gets, and bare soil gets colder than mulched soil – all of which highlights the balancing acts necessary in gardening. Pests notwithstanding, bare ground isn’t good for plants and soil. Plant roots are more likely to be damaged by the increased exposure and, especially evergreens, are more apt to dry out, because more water will evaporate from bare ground and because roots have a hard time drinking in water from frozen ground. Bare ground is also subject to erosion and nitrogen loss.

On the other side of the coin, bare soil goes through more cycles of freezing and thawing, which breaks up and moves around soil particles – in effect, tilling the soil. Back to the previous side of the coin, that freezing and thawing can move soil around enough to heave plants – especially small or newly rooted plants – up and out of the ground.

So, I like cold weather for my plants. But I mulch heavily. And I especially like it, as do the plants (and, admittedly, some pests) when there’s an additional blanket of snow over the ground. It also makes for good skiing.

@ Lee Reich

Any gardening questions? E-mail them to me at garden@leereich.com and I’ll try answering them directly or in this column. Check out my garden’s blog at www.leereich.blogspot.com.
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