Annuals Gardening Light Needs of Plants

Pale Growth on an Overwintering Annual

Cuphea suffering from etiolation. Photo: Rachel Bernier

Question: I’m overwintering a cuphea Vermillionaire on my windowsill after a friend tried this last year with success. But I find its growth weak and pale, even if it is placed in my sunniest window. Should I prune it back regularly to strengthen its stems?

Rachel Bernier

Answer: The appearance of your Cuphea Vermillionaire® plant shows it simply lacks light, which explains why it is etiolated (showing weak, pale growth).

Honestly, that’s a pretty normal situation for an overwintering annual. Due to the short days and, in many climates, persistent gray weather, fall and winter sunlight is far less than the plant really needs, even in the brightest window, so it etiolates: stretches as if to try and grab a bit more sunlight. By cutting it back, you’ll at least keep it fairly compact until days lengthen.

And, of course, they will. You should notice a huge change in the plant’s growth in starting in March and early April. Its new stems will be shorter and its foliage denser and greener. In fact, as spring progresses, it will probably start blooming again to a certain degree, although not as heavily it will outdoors (indoor sunlight is never as intense as sunlight outdoors).

20190121B www.provenwinners.com.jpg
The appearance of Cuphea Vermillionaire outdoors in full sun. Photo: http://www.provenwinners.com

When there is no more risk of frost, acclimatize your cuphea to outdoor conditions and give it full outdoor sun. In no time it will again be as gorgeous as it ever was!

Larry Hodgson is one of Canada’s best-known garden communicators. After studies at the University of Toronto and Laval University where he obtained his B.A. in modern languages in 1978, he succeeded in combining his language skills with his passion for gardening in a novel career as a garden writer and lecturer. He has notably been editor-in-chief of HousePlant Magazine, Fleurs, Plantes et Jardins, À Fleur de Pot and Houseplant Forum magazines and is currently the garden correspondent for Le Soleil and radio garden commentator for CKIA-FM Radio. He is a regular contributor to and horticultural consultant for Fleurs, Plantes, Jardins garden magazine and has written for many other garden publications in both the United States and Canada, including Canadian Gardening, Harrowsmith, Horticulture, Fine Gardening, Rebecca’s Garden and Organic Gardening. He also speaks frequently to horticultural groups throughout Canada and the U.S. His book credits include The Garden Lover’s Guide to Canada, Complete Guide to Houseplants, Making the Most of Shade, Perennials for Every Purpose, Annuals for Every Purpose, and Houseplants for Dummies, as well as nearly 50 other titles in English and French. He can be seen in Quebec on French-language television and was notably a regular collaborator for 7 years on the TV shows Fleurs et Jardins and Salut Bonjour Weekend. He is the President of the Garden Writers Association Foundation and the winner of the prestigious 2006 Garden Media Promoter Award offered by the Perennial Plant Association. An avid proponent of garden tourism, he has lead garden tours throughout Canada and to the gardens of over 30 countries over the last 30 years. He presently resides in Quebec City, Quebec.

0 comments on “Pale Growth on an Overwintering Annual

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out /  Change )

Google photo

You are commenting using your Google account. Log Out /  Change )

Twitter picture

You are commenting using your Twitter account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.

%d bloggers like this: