Tag Archives: fall gardening

Fall Harvest: Plants that are Sweeter After a Frost

Fall gardens are generally touted as being a great way to get another harvest out of a small garden. They’re great for a few other reasons too. Fall is a wonderful time to work in the garden as the heat and humidity lessens. There’s also generally less pest pressure in the fall, meaning you might still get to put up some sauerkraut even if cabbage moths attacked your spring cabbage crop. A lesser discussed benefit is that some fall crops actually become sweeter after a frost.

Why are plants sweeter after a frost?

Unlike animals, vegetables can’t move south for winter, find a cozy den, or grow and extra thick coat. To survive the cold, certain plants have evolved a way to cope with colder temperatures. First, the plants’ cell walls thicken. These thicker walls contain less moisture and freeze less easily. The other part of this process, is the one that we as gardeners relish, the plants convert more of their starches to sugar. This has several benefits. Using the sugar produces energy, in effect, keeping the plant warmer. The sugar also decreases the formation of ice in the cell and prevents the cell membrane from freezing. This process is good for the plant and tasty for the gardener!

What plants do this?

Brassicas (Cabbage Family)

  • Cabbage
  • Kale
  • Brussels Sprouts
  • Kohlrabi
  • Collards

These plants thrive in cool temperatures making them ideal for fall planting. They can withstand temperatures down to 20°F and some like burssels sprouts can withstand much colder (down to 0°F). Row cover can be used to extend the season further and protect crops from damaging cold winds.

Carrots & Beets

Both beets and carrots benefit from a layer of mulch around their tops in cold weather. In southern climates, these roots can be left in the ground over winter and harvested as needed. To protect the tops for eating beet greens or to keep them growing you may need to use row cover or a cold frame to protect them during consistently cold temperatures.

Turnips & Rutabagas

Turnips and rutabagas are vastly sweetened by cold temperatures. Rutabagas should be harvested before temperatures drop to 20°F but turnips can handle colder temperatures particularly if they’ve been covered in a thick layer of mulch.

Leeks

In many areas, leeks can be overwintered and survive temperatures down to 10°F. If you’re harvesting leeks from frozen ground our friend Pam Dawling recommends pouring boiling water on the base of the plants if you’re harvesting a few for immediate use.

Swiss Chard

Swiss chard is fairly cold-hardy but it does best with some protection particularly if you live in an area with strong winds. To prolong your chard harvest use row cover or a cold frame. We’ve found Ruby Red Swiss Chard to be more frost tolerant than other varieties.

After a long summer it can be difficult to find the time and motivation to sow a fall garden. It really is worth it though! Plant a few of these crops for a sweet fall harvest.

Fall Gardening Checklist

For many fall seems like the time when things begin to wind down. It’s time for hot meals, enjoying the harvest, and snuggling up by the fire. However seasoned gardeners know that spending more time in your garden in the fall can lead to an easier spring. There’s still plenty of projects!

Sow fall crops.

There’s actually many varieties that are great for fall planting. Plants like garlic and winter wheat do best with a start in the cool months of fall. There’s also many root vegetables like carrots, beets, radishes, and turnips that can provide a late harvest along with hardy greens like arugula, pak choi, spinach, and mustards. Depending on your zone you may need to use season extenders like low tunnels and cold frames to keep your garden alive in late fall and winter.

Make sure there’s no exposed soil!

This is super important to maintaining a healthy and productive garden. Leaving soil exposed kills off beneficial fungi, bacteria, and insects. It also makes soil vulnerable to erosion and allows weeds to get an early hold in the spring.

The best way to combat this is though the use of cover crops. You can find more about planting fall cover crops and Southern Exposure’s offerings from this article, Fall Cover Crops & Their Importance. You can even use some traditional food crops (like mustard greens) as cover crops! If you cannot plant a cover crop at least consider covering the garden in mulch such as old leaves, hay, straw, or shredded newspaper. These block weeds, provide habitat for beneficial insects, and hold moisture which is necessary for good bacteria and fungi to thrive.

Plant some perennials.

There’s also many perennials you can add to your garden in fall. Perennial onions and certain flower bulbs like crocuses and daffodils are great for fall planting. Many fruit and nut trees and bushes can be fall planted as well.

Mulch existing perennials.

Placing mulch around the base of existing perennials can help prevent frost from reaching killing the roots (especially important with newly established plants). It can also help prevent weeds in the spring while you’re busy with spring planting and as it breaks down it will add nutrients to the soil. When mulching try to avoid making a thick “volcano” mulch mound around the trunk or base of the plant. Piles of mulch like this provide places for rodents to hid and chew on your plants.

Take care of your tools and equipment. Speaking of tools, you will definitely feel the need for a Cordless hedge trimmer for your garden, as this device works wonders in maintaining the aesthetics of your garden.

Fall maintenance can help keep your garden tools in tip top shape. Make sure to brush at least most of the dirt off your tools and sharpen any that need it. Some people use a bucket full of sand and old vegetable oil to plunge bladed tools (like shovels) into to get them extra clean and sharp after the big chunks of dirt have been removed. You may also want to sand down and rub linseed oil on any wooden handled tools that need it. Any equipment that uses fuel like rototillers should be drained or run out of fuel for winter. This is because leaving fuel for that long without running the equipment can plug up carburetors.

If there’s tools or equipment that need replaced or equipment which needs professional maintenance it’s best to get it over with in the fall without the pressure of spring planting looming.

Start Planning for next year.

Garden Planner Example (2018 Mintlaw Allotment)

While not everyone may be enthused about having an extensive plan for their garden having a few basics mapped out can help you create an easier to manage and more productive garden. Planning should include looking at what seeds you still have or have saved considering what seeds you’d like to purchase and reconciling that with how much your garden will actually fit (not as many as anyone wants to believe). You should also consider a crop rotation including any areas that will be in cover crops. You can find the Southern Exposure garden planner to help with that here. You may also choose to consider your seed starting set up for next year. Some garden supply stores will have sales in the fall which you can take advantage of instead of paying full price next spring.

Test and amend your soil.

People typically test their soil and add amendments in the spring but there’s no reason not to get this checked off in the fall. It’s actually preferable to add things like manure in the fall so that it decomposes as much as possible before planting.

Leave some things alone.

The rest of this article may add a bunch of projects to your to do list but here’s one thing you can skip. Don’t cut down, rake, and remove all the dead plant material from your garden unless you’re combating a specific disease or insect that overwinters in the material. While you may think your garden looks tidier barren this plant material actually helps many beneficial insects survive the winter.

Get a step ahead in your garden while the weather is cool and pleasant. By doing some basic fall tasks you can be prepared for spring planting and get crops in the ground right on time. You may also end up with a healthier more productive garden without too much effort. Happy autumn!

Fall Cover Crops & Their Importance

Fall is actually one of the best times for backyard gardeners to work on improving their soil health. Without a lot of effort gardeners can improve the soils through the fall, winter, and early spring for a better gardening season next year through the use of cover crops. Cover crops are not just for large farms and have a variety of benefits.

Benefits

Reduce Erosion

First off, using a winter cover crop is extremely important in resducing erosion. When there’s nothing growing in the soil in fall, winter, and early spring any rain or melt water can erode valuable soil and nutrients and pollute the local water system. Too many nutrients in the lakes, streams, and river can cause algae blooms that can be dangerous to both people and aquatic life.

Add Organic Matter

As cover crops die or are tilled into the soil they add organic matter which is key to soil health! It gives the soil structure, retains moisture, provides habitat and food for beneficial insects and microbes, and adds nutrients to the soil as it slowly breaks down. If not tilled in the pant material also functions as a mulch to continue to suppress weeds, preserve moisture, and reduce ersosion.

Conserve Moisture

In the same way that open soil is vunerable to ersion it’s also vunerable to evaporation.  Cover crops prevent sun and wind from drying out the soil and hold rainwater.

Some Fix Nitrogen

Any cover crop variety that is a legume actually adds nitrogen to the soil as it grows in addition to the nutrients it provides when it dies or is tilled under. Some examples SESE carries will be given below.

Suppress Weeds

Cover crops also help to suppress weeds. Most cover crops are quick growing and vigorous allowing them to outcompete and knock back weeds.

Help Pollinators

Often your fall cover crops will be one of the first plants blooming in the spring, a critical time for pollinators. Planting in the fall gives you and them a jump start. They’re provided a reliable food source early helping you ensure reliable pollination throughout the growing season.

Fall Cover Crop Varieties

Southern Exposure offers a variety of cover crops suitable for fall planting.

Hairy Vetch

Hairy Vetch is both beautiful and useful. Bees and other pollinators love its purple flowers. It’s also a nitrogen fixing legume. Sow August 1st – November 1st.

Hairy Vetch Seed

Austrian Winter Peas

This awesome crop can be grown through the winter in zones 6 and up. It’s nitrogen fixing and edible! Sow August 15th – November 1st.

Austrian Winter Pea Seed

Buckwheat

Buckwheat isn’t really a winter cover crop becuase it’s what is called a “winter-kill crop” meaning that it dies back with the fall frosts. However it’s great for planting in the fall with a mix of clover because it provides clover shade and cool soil until it dies allowing th clover to take off. It can be planted in the spring up until 1 month before the last fall frost.

Buckwheat Seed

Crimson Clover

This nitrogen fixer does best where winter temperatures don’t dip below 10°F. It has longer blooms than traditional red clover. Sow from mid-July through mid-September.

Crimson Clover Seed

Red Clover

Red clover has a lot going for it. It’s well loved by pollinators, fixes nitrogen, is great for weed supression and makes a wonderful, medicinal tea. Sow in spring or fall.

Red Clover Seed

White Dutch Clover

Like the other clovers White Dutch is excellent for nitrogen and supressing weeds. Sow in late winter, spring, late summer, or fall.

White Dutch Clover Seed

Hulless Oats

Hulless Oats make an excellent cover crop for adding a lot of organic material. It should be noted that they will winter kill in areas where the temperature drop below 10°F. Oatstraw stems can be harvested for tea. Sow in later summer for a winter cover crop.

Hulless Oats Seed

Common Winter Rye

While Winter Rye is not nitrogen fixing it’s still an excellent cover crop. It can actually help stabilize excess nitrogen and releases phosphorus and potassium from the soil for plants to use. It’s extensive root system makes it excellent for improving soil structure. It’s also vigorous and great for weed supression, erosion reduction, moisture conservation, and adds tons of organic material to the soil. Sow August 1st – November 15th.

Common Winter Rye Seed

 

Just because the gardening season is coming to a close doesn’t mean there’s not still planting to be done. If you want a healthy productive garden next year it’s definitely worth the effort to plant a cover crop this fall!