Hartley Magazine

All the latest news, hints, tips and advice from our experts

Shade Cloth – the greenhouse savior, no matter what latitude

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 […]

Propagating Streptocarpus (Cape Primrose)

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 […]


Out-of-Season Potatoes! In Your Greenhouse

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 […]


Late Blight in Tomatoes and Potatoes

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 […]


Tomatoes 101 – Year Round Love in the Greenhouse

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 […]

The Philadelphia Flower Show 2016 – America celebrated.

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 […]


Valentine treat: Mid -Winter in a 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 […]


Propagating Geraniums – A Fun February project

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 […]

All about Heating Mats – the green house winter necessity

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 […]


Clivia in the Greenhouse

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 […]