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The Bay Gardener by Dr. Francis Gouin

If you use this powerful herbicide, be sure you use it right

Roundup has its uses, but before you consider spraying the herbicide, you should know what it’s good for — how damaging it can be and where it does no good, even ill.     Roundup kills plants by degrading the mitochondria in the roots. I began studying Roundup in 1976, when it was called glyphosate. Our research established rates of application, best time of application, plant response and phytotoxicity on desirable plants. Since then, we have learned a great deal more about Roundup and the care you should exercise when using it.

There may be a fungus in your soil

Every year, a number of readers complain that their garden did not produce as much as last year’s.     If your garden is on poorly drained soil, you can blame some of the problem on wet feet. All vegetable-producing plants demand well-drained soils. Soils that tend to remain wet for several days after a hefty rain can cause roots to rot, thus reducing crop yields.     Or your problem could be a fungus.

Lusby and Spooks

Lusby was so full of energy when we acquired her that I concluded she was nuclear-powered. Thus the name Lusby, for the location of the Calvert Cliffs Nuclear Power Plant. The one thing she does not do much of is lie around doing nothing.

Their lifespan is just too short

My German shorthair pointer, Sophie, passed away this past winter after 13 years of memorable companionship. Her absence is almost as imposing as was her presence. A flicker of movement off to the side still makes me turn my head, expecting her to bound up to my side. Returning home, I can’t help but look for her bright eyes shining in a front window as she somehow anticipates my arrival once again.

Crop rotation keeps you harvesting into winter

If you planted potatoes, you could already be harvesting. Since potatoes are grown in wide rows, the ground they occupied will be ideal for planting a fall crop of peas and snap beans.     If you have harvested cabbage, broccoli, cauliflower and kohlrabi, use the space vacated for okra. If you planted a spring and early-summer crop of snap beans, the free space can be used for planting fall and winter crops of carrots, beets, kale, collards, turnips, rutabaga, radishes and ­lettuce.

Get cutting to ensure big-flowering mums and azaleas

With all the rain we have received this year, azaleas and chrysanthemums have produced an abundance of new growth. If you want those plants to produce an abundance of flowers — this fall for chrysanthemums and next year for azaleas — get out your shears this week.

What you’ll gain (and lose) — plus how to get started

Growing vegetables in raised beds is highly recommended when there is limited space, or if your soil does not drain well or is stony. But to be successful, the selected site needs at least eight to 10 hours of full sun if your intent is to grow tomatoes, peppers, onions, garlic, eggplants, squash, cucumbers and snap beans. With less than eight hours of direct sun, you will be limited to growing lettuce, spinach, Swiss chard, cabbage, broccoli and kale.

Gene splicing is latest form of ­systematic plant breeding

What do I think about genetically modified plants? Here’s my answer to that question I so often hear.

Learn the trick — and the science

Hardy mums planted for color last fall most likely survived the winter and are now rising in clumps in your garden. Here’s how to get them ready to bloom again this fall.     To move mums to new spots: For lots of smaller plants, dig the clumps and divide them into smaller clumps of one, three or five stems each, with roots firmly attached. Transplant them 12 to 18 inches apart. After they have started to grow, prune the stems, leaving only three or four leaves near the bottom of the stem, for two to three branches per plant.

Pros and cons of straw, paper, ­plastic and reflective mulches

It is a big mistake to mulch your tomato plants when you plant them. When organic mulches such as straw are applied at planting time on cool soil, the cool will linger. This will retard growth, flowering and fruiting. Wait to mulch vegetable gardens until soil temperatures are between 70 and 75 degrees.