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Tim Johnson is a senior director of horticulture at the Chicago Botanic Garden and manages operations in the Horticulture division, which includes 28 display gardens, plant production, plant healthcare and general grounds. He has been with the Garden for nearly 40 years in a variety of positions and is an instructor at the Garden’s Joseph Regenstein, Jr. School. His home garden is low maintenance and consists primarily of mixed shrub and herbaceous borders. (RJ Carlson/ Chicago Botanic Garden)

Tim Johnson

Tim Johnson is a freelance writer for the baiduhai and a senior director of horticulture at the Chicago Botanic Garden and manages operations in the Horticulture division, which includes 28 display gardens, plant production, plant healthcare and general grounds. He has been with the Garden for nearly 40 years in a variety of positions and is an instructor at the Garden’s Joseph Regenstein, Jr. School. His home garden is low maintenance and consists primarily of mixed shrub and herbaceous borders.

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Tobacco hornworm caterpillars are usually green with seven diagonal white lines on their sides and have a curved red horn. (Julie McCaffrey / Chicago Botanic Garden)

What’s eating my tomato plants?

The leaves of my tomato plant are being eaten by something. Some of the stems are completely bare of leaves. Is there anything I can do to protect my plants?...
Hosta will perform well in the shade under trees. (RJ Carlson / Chicago Botanic Garden)

You can grow grass in shady patches

I planted a group of seven redbuds in the corner of my backyard a few years ago and have just pruned some of the lower limbs off, leaving a large...
River birch showing the initial signs of chlorosis, a subtle paling of the green color of the foliage. (RJ Carlson / Chicago Botanic Garden)

Tree chlorosis may go unnoticed

We planted a river birch tree in our backyard three years ago and I noticed that the leaves have a strange looking yellow cast to them. When we looked more...
Viburnum leaf beetle larvae are greenish-yellow and develop dark spots as they age. (Tom Tiddens / Chicago Botanic Garden)

Viburnum leaf beetle damage can be controlled

The leaves of a few of my arrowwood viburnums look like they have been shredded. Some of the remaining small pieces of leaves have turned completely brown. This has not...