If it has holes in it, water will find a way through it.
This is true for your tent, your roof, and your garden. In fact, permeability is pretty much the name of the game when it comes to plants and soil.
The rate at which water flows through something else is called permeability. If you’ve ever tried buying a home, you were probably required to pay someone to conduct a perc test. Real estate percolation tests are done to make sure that your house won’t wash away when it rains and that your septic system won’t back up into the livingroom. A percolation test In the garden can help your plants get the water and nutrients they need without drowning. Before we learn how to conduct a perf test, let’s find out why it’s important.
Water in the soil
In the garden, water and air flow in and out of soil, leaves, and even individual plant cells. For a plant, this is the Stuff of Life. The water and air that flow in and out of a plant’s cell walls carry sugars, minerals, oxygen, carbon dioxide, hormones, waste products, and chemicals that allow your plants to thrive or die. [If you’ve ever battled poison ivy or poison oak on your property, you can use a leaf spray that gets absorbed through the stoma (sort of like pores) and carried down to the roots through the phloem. The chemical kills the plant at the roots. This only happens because of the permeability of the leaves.]
Now, too much of a good thing is a bad thing. Without adequate permeability, your plants will drown, suffocate, dehydrate, or starve. Not good. Healthy soil is made up of different size bits of sand, loam and clay. The spaces between these bits are called macropores and micropores, depending on their size. Air and nutrient rich water pass through these spaces, feeding and nurturing your plants. If the spaces are too small (or absent), plant roots cannot get to the food and air they need to live.
So, how can you, as a gardener, improve the permeability of your soil?
• Avoid overwatering
• Aerate compacted soil
• Apply mulch and compost
• Avoid walking on wet soil
Signs of permeability problems:
• Standing water
• Hydrophobic soil
• Chlorosis (loss of green color)
How to conduct a percolation test for soil permeability:
Ideally, you will want the water to drain at a rate of one or two inches per hour. Of course, sandy soil will drain much faster, taking valuable nutrients with it. You can improve the holding capacity of sandy soils by adding aged manure or compost. If your soil contains more clay, like mine does, you can improve permeability by adding… you guessed it - aged manure or compost! Compost and aged manure add organic material to the soil, creating a wider variety of sizes of both soil and spaces. This variety allows for healthier growth and drainage.
Paved areas can lead to drainage and permeability problems. Permeable paving materials solve this problem by creating a firm surface for walking and parking while still allowing water to seep through. Permeable paving materials are affordable and attractive. They can also eliminate weeds growing up between paving stones!
Do your garden a favor by learning about permeability and composting!
Mud pies may have been a blast in childhood, but your garden will appreciate it if you play elsewhere when the soil is wet.
Soil, silt and clay, mixed with water, creates a slick, slimy ooze that has been used to make adobe bricks, functional pottery, facial masks and exterior stucco. Mud also provides a nutrient-rich habitat to snails, clams and frogs. When your garden soil is muddy, however, it is time for patience. Muddy soil is easily compacted, making life difficult for young (and not so young) plant roots.
Too much of a good thing
All plants need water, but heavy rains and flooding are another story. As soil becomes saturated with water, oxygen is forced out of the ground. Plants need oxygen to survive. Even after the soil dries out, some plants may be stunted and production may be lower. If the soil stays too wet for too long, plants can die. Extended periods of wetness can actually drown the soil, creating a black, stinky mess.
Healthy soil has empty spaces between chunks. These pockets (called macropores and micropores, depending on their size) provide pathways for air, water and nutrients. Unless you live in Florida, where sand is predominant, walking on muddy soil can crush those pockets, reducing drainage. Walking on muddy ground can also damage delicate plant roots. Compacted soil requires aeration. Once compaction occurs, you must wait until the soil dries out before repairing that damage.
Mud over time
If there are places in your yard or garden that do not drain well, you can dig a shallow trench or install a rain garden nearby. In both cases, water is redirected away from plants. Then, try to determine the cause of your drainage problem. Is a slope causing water to converge on an area? Is more organic material needed? Is there a leaky pipe or sprinkler nearby? It may even be an overflowing septic system. In that case, your family's health could be at risk.
Reduce potential mud problems
In addition to creating a rain garden or swale, and eliminating water leaks, there are several other ways that gardeners can reduce the potential for problems caused by mud and poor drainage. Continue incorporating aged compost and other organic matter, once the soil is dry. Install moisture-loving trees, shrubs, and other plants in low areas. With all that moisture, slugs and snails will be out in force, carrying diseases and feeding, so putting in some extra time hand-picking these pests can keep plants healthier.
Rather than damaging your soil and your plants' roots, take advantage of muddy days and do something else: sharpen your tools, clean planter pots, or, my favorite, peruse seed catalogs!
When I was 3 years old, my mother was horrified to discover me sitting in the backyard eating worms. We rushed to the doctor where she learned that worms are not bad for you. On the contrary, they are actually a source of harmless protein. Personally, I’m glad I don’t remember…
Well, clearly, we don’t ave any 190-foot worms in our gardens. But what we do have is worth its weight in gold, horticulturally speaking. Terrestrial earthworms feed on dead and living organic matter. Their squiggly little bodies are basically organic matter processing machines. Food is sucked in through the mouth, coated with mucous, mixed with calcium and then mashed in the gizzard. Nutrients are absorbed and everything that’s left is excreted in a paste called casts. Casts contain valuable nutrients that are available to plants, so the more earthworms you have in your soil, the better.
Earthworms also help your soil as they burrow. Their tunnels create passages for air and water. This improves soil structure, aeration and percolation. A single earthworm can produce as much as 10-pounds of castings in a single year if there is enough organic matter available.
Garden shops and websites offer worms for sale but it's generally a waste of money. If your soil is inhospitable to worms, they won't stick around long enough to do your yard much good. Build a hospitable environment and they will come. So, how can you improve the odds of having worms in your garden?
Did you know that earthworms are hermaphrodites (both male and female)? Also, did you know that earthworms are born with all of there segments they will ever have?
Wikipedia provided this interesting bit of trivia about worms:
Darwin estimated that farmland contains up to 53,000 worms per acre, but more recent research has produced figures suggesting that poor soil may support 250,000/acre and rich fertile farmland may have up to 1,750,000/acre, meaning that the weight of earthworms beneath a farmer's soil could be greater than that of the livestock upon its surface. [https://en.wikipedia.org/wiki/Earthworm]
I spent the morning rescuing worms from my concrete patio and adding them to potted plants. I figure it beats being eaten by birds or drying to death...
Finally, there are some varieties of earthworm that can reach nearly 10-feet in length.
Let me know if you see one, okay?
Bulbs are actually the modified stems of perennial monocotyledons*.
These plants have evolved to store food reserves in a globe-shaped underground bud that is protected with overlapping, expanded leaf bases. Some bulb plants, such as onion and garlic, have a papery protective layer over these underground leaves, while scaly bulbs, such as the lily, have no protective layer. Bulbs can be as tiny as a pea or as heavy as 15 pounds!
December and January are the best time to plant spring bulbs in the Bay Area. (May is the best time to plant fall bulbs in our area.) Follow these steps to ensure the long term survival and overall health of your new bulbs:
*The only exception is a few varieties of Oxalis, which are dicotyledons.
To say that something is tenacious means we view it as determined and persistent.
When we talk about life in the garden (or the refrigerator), tenacious is the only word that comes even close to conveying the unrelenting drive to survive of every seed, root, bug, egg, or microbe with a DNA strand.
After the wonderful chaos of the Thanksgiving weekend, this onion survivalist was found in a plastic container in the back of my fridge.
This onion, mutilated, severed, and chilled, exemplifies the battle that gardeners face on a daily basis against weeds, pests, and disease.
To be a successful gardener, one must be as tenacious as this onion. Against countless obstacles, we gardeners must strive to put down roots and provide a rich growing medium for those in our charge. We must also reach upward and outward for energizing sunlight and faith that we can continue. And we must be sure to stay hydrated.
If this onion can keep trying, so can we. Happy holidays!
Late autumn and early winter often leave our gardens looking bare and unsightly. One way to improve both the appearance and the health of your garden is to use winter cover crops.
Cover crops, also known as green manure, are grasses and legumes that grow quickly. As soon as summer crops are harvested and the last, struggling tomato plant has succumbed to frost, you can plant your cover crops. Any rains that come will help speed their growth. Before they can flower, they are cut back and/or tilled back into the soil.
Legumes are particularly valuable as they add nitrogen to the soil. Popular legume cover crops include Black-eyed peas (pictured above), Fava beans, soy beans, red or crimson clover, and hairy vetch. You can even grow peas and keep trimming the tips (which are excellent in salads) to prevent them from flowering and going to seed. Once a legume has gone to seed, it begins pulling nitrogen from the soil like any other plant. Of course, there's nothing wrong with fresh peas and beans!
Cover crops also help reduce erosion, suppress weeds, and improve soil health. Inexpensive and easy to grow, cover crops are a simple investment in your garden’s long term health. [They look nice, too!]
You can grow a surprising amount of food in your own yard. Ask me how!