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Hardiness Zone or Frost Dates: Which One Should Vegetable Gardeners Use?

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  Two numbers show up in almost every gardening guide: your USDA hardiness zone and your frost dates. They are often mixed up, but they answer different questions, and for vegetables the second one usually matters more. What a hardiness zone tells you A hardiness zone is based on the average coldest winter temperature in your area, grouped into ten-degree bands. It answers the question will this plant survive the winter here? That makes it very useful for perennials, fruit trees, shrubs and herbs such as rosemary, which have to live through the cold months. What frost dates tell you Your last spring frost and first fall frost mark the edges of the frost-free growing season. They answer a different question: when can this plant safely be outside? Most vegetables are annuals that you replant every year, so they never face the winter. What matters to them is the stretch of mild weather between the two frosts. Putting both to work Annual vegetables such as tomatoes, beans and lettuc...
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A 15-Minute Routine for Testing Your Garden Soil pH

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  Most vegetable gardens do best in slightly acidic to neutral soil, but your own soil may sit well outside that range. A pH test takes about fifteen minutes and tells you whether lime, sulfur or nothing at all is the right next step. What you need A clean plastic bucket, a trowel, distilled water if your kit uses it, and either a home test kit or a bag for a lab sample. Avoid metal tools if you are sending soil away, since they can contaminate the sample. Take a good sample Pick a bed and walk a loose W through it. At five spots along the W, dig a small hole about six inches deep (shallower for lawns) and scoop a slice of soil from the side. Put all five scoops in the bucket and mix them well. This gives you one average sample instead of one lucky spot. Let it dry out of direct sun if it is very wet. Read the result Follow the kit instructions exactly, since the steps differ between brands. A home kit gives a rough colour reading. A lab test through your local extension office cos...
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A Simple Countdown for Starting Seeds Indoors

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  Starting seeds indoors is mostly a matter of timing. Plant too early and seedlings grow leggy and root-bound before the weather allows planting out. Plant too late and the crop loses weeks of its season. Counting backwards from your last spring frost date solves this. The countdown 8 to 10 weeks before: peppers and eggplant, which grow slowly and like warmth. 6 to 8 weeks before: tomatoes, plus onions and leeks if you start them from seed. 4 to 6 weeks before: broccoli, cabbage, cauliflower and kale for a spring crop. 3 to 4 weeks before: lettuce, if you want an early head start. 2 to 4 weeks before: cucumbers, squash and melons, which dislike root disturbance and grow fast. These are typical ranges. Your seed packet is the best guide for a specific variety, so treat the list as a starting point. What seedlings actually need Use a light seed-starting mix, not garden soil. Keep it evenly damp like a wrung-out sponge. Once seedlings emerge, light matters more than anything els...
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How to Use Your Last Frost Date Without Getting Caught by a Late Cold Snap

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Every gardening guide tells you to plant after the last frost date, but that date is only an average. In roughly half of years the final frost of spring arrives later than the number printed on the chart. The practical question is not what is my date but how much risk am I willing to take with each crop . Sort your crops into three risk groups Hardy crops such as peas, spinach, kale, onions and radishes shrug off light frost, so they can go out weeks before your date. Half-hardy crops such as lettuce, carrots, beets and potatoes are usually fine a week or two early if the soil is workable. Tender crops such as tomatoes, peppers, cucumbers, squash and basil should wait until the date has passed and nights are reliably mild. Check the forecast, not just the calendar Look at the overnight low for the next seven days before you set out tender plants. A night forecast near freezing is the signal to hold off or cover. Cold air settles in low spots, so a corner of the yard can frost while...
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