One recent sunny day I forgot to open my greenhouse doors and windows in the morning, and by noontime the temperature inside had reached 108˚. The plants were sadly wilted, so I quickly misted the entire greenhouse to lower the temperature and raise the humidity. Fortunately, by late afternoon, the sagging plants had recovered, but […]

At any given time, my greenhouse holds about 30 Streptocarpus plants, commonly called Cape primrose. I give many to friends who, like me, love to see them bloom, so I have to keep constantly propagating these plants. This is done in an unusual way, using a leaf from a mother plant. First, select a leaf […]

Growing potatoes in your greenhouse may not seem very exciting or even particularly worthwhile. After all, you can buy a bag of spuds for a few dollars. But imagine growing high-value fingerlings such as Russian Banana, Rose Finn, or Blossom. These can be hard to find in a grocery store, especially during winter. And they […]

For greenhouse owners and gardeners in the Carolinas and Georgia, here is some disturbing news: Some tomato plants in Beaufort County, South Carolina, have recently been infected with late blight disease, the same highly infectious scourge that caused the Irish potato famine in the 1840s. Tomatoes and potatoes are related species, both belonging to the […]

In northern parts of America greenhouse owners are just now starting tomato plants from seed ready for the new season. Under lights on the heat mat I have some fifteen varieties growing. These will be transplanted into larger pots until they are ready for my garden and the gardens of friends. But often tomato varieties […]

If you are a greenhouse owner in the northeast you should treat yourself – take a trip to the Philadelphia Flower show. What makes it spectacular?  The show is held in early to mid-March when there is very little in bloom outside of the greenhouse. Many of the prizewinning plants are grown by enthusiastic greenhouse […]

Deer tracks in the snow show where a hungry buck gazed wistfully through the glass at the tasty-looking green plants inside your greenhouse. Squirrel and rabbit tracks betray the presence of other wistful watchers that would envoy your greenery even more than you. That’s why they’re called greenhouses – because in winter they remain green […]

If you’ve ever brought geraniums or pelargoniums into your greenhouse at the end of summer, you probably know how leggy the plants become in winter’s low light levels. Come spring, you can cut back these plants significantly to get them started anew, but the initial result is an ugly brown stem visible in your hanging […]

Winter is the time when many greenhouse owners are thinking about starting seeds. They may be reading through catalogs, cleaning pots, checking their supply of potting soil, and perhaps placing orders. But one thing that is often overlooked is a heating mat to go under your seed flats. With the gentle bottom heat that a […]

Have you ever tried to use a full-length broom in your greenhouse? I have and almost broke a window. I also tried using a full-sized hoe in one of my greenhouse beds only to knock plant pots off the shelf behind me. After these experiences and a few more too embarrassing to mention, I decided […]

Europeans discovered clivias in Cape Province, South Africa, in 1815, and soon after some of the plants were taken to England. The Duchess of Northumbria, Lady Charlotte Percy (nee Clive) first succeeded in getting them to flower there, so the genus was called Clivia in her honor. Although more than 1,000 clivia cultivars and hybrids […]

I was digging over a garden bed last week and dug out several Oriental lily bulbs. When you dig out “oriental” or “Asian” lilies, be sure to use a garden fork, not a spade. A spade will slice into the bulbs. These had not been dug for five or six years so it was time […]