Growing gardens under oak trees? Jennifer asks if it can be done:
Dear David, I have 10 very mature oaks in my front yard. At the base of one of the oaks I have started my food forest experiment. I dumped a layer of compost, a variety of seeds (squash, beans, herbs, morning glories, echinacea, passionflower and i forgot what else lol!), and light mulch because of the oak roots, it is growing good so far. So we talked about before i would begin to stop raking leaves and let the leaf litter collect. I would then have a self mulching landscape. From my understanding not much will be able to grow as ground cover since the leaves will ultimately smother them out. I know i can grow vines that travel up though. Also any fruit trees or bushes will be of low yield since they would only receive dappled light. Is the solution to just plant more?? Please tell me if what all I am saying is true? Also I am thinking this is a mesic oak hammock since we are on a lake but our house is not in a flood zone because we sit up in the hammock zone. Hope that helps. Thanks Jennifer
I like her approach. Compost and a big mix of seeds. My kind of growing.
There are two issues here that I can see. Let’s tackle them both
1: Too Much Shade
Oaks are hard to garden under, but I hate to remove them. I explore this conundrum and my thoughts on it in my book Compost Everything in the chapter on “Stupid Worthless Trees.”
I was joking when I called them stupid worthless trees, but that’s the way many people view big, “non-productive” trees. An oak or a maple or a sweetgum is viewed as worthless by many food growers because they aren’t good sources of food. Sure, you can eat acorns or tap maples, but the work involved with processing makes them a less-than-desirable source of food.
Jennifer has a different approach. She’s letting them drop leaves and feed the soil, which large trees are great at doing. They also support other species such as birds and mushrooms—sometimes even edible mushrooms—so they’re vital parts of the ecosystem.
The problem is the shade they create. Gardening under oaks isn’t easy unless you’re growing shade-tolerant plants. I grew grape mahonias, pineapples and gingers under mine back in North Florida. Around the edges of oaks you can also grow citrus and other fruit trees provided they get enough light. It takes a lot of solar energy to get fruit-producing vegetables like squash, tomatoes, peppers, beans, etc., to make much worth eating.
Throwing down a lot of seeds is a good idea, though—Jennifer may discover some species which are more tolerant than others of the shade.
Sometimes you can strategically remove limbs and open up the canopy to keep things growing underneath.
Planting a big variety is a good idea. The area may not be as productive as it would be without the canopy, but the oaks will buffer the overnight lows during the winter and can help you push the zone, so there are benefits.
Research shade plants for your area, test lots of species, then see what flies.
2: Leaves Covering Everything
If you are starting plants from seeds, having a lot of leaves drop can crush out young seedlings and make it hard to get things started; however, if you plant seeds when leaf drop is minimal, the plants should get established before the leaves get too thick. Older plants will be fine and the leaves will feed their roots as they grow.
One of the things I love about mature trees is how many leaves they drop. Leaves are great food for the soil and your compost pile. Perennial vegetables are easier underneath oaks, which is one reason I loved ginger. It likes the shade and will grow through leaves without trouble.
Something worth doing: travel to local parks with natural woodlands and observe what is growing beneath the oaks in wild areas. See if you can mimic what is happening in your own yard. Look for species that are edible. Smilax? Try growing its cousin asparagus.
Beautyberries? Sure, plant some of those!
Violets? They’re a good edible.
Wild blackberries? Plant some cultivated types.
See if you can find patterns in nature and then put those patterns to work in your oak gardens. I learned this concept from the late Toby Hemenway and it has worked wonderfully.
It’s not easy to grow a garden under oak trees, but it’s not impossible. Keep planting and follow your intuition and your observations.
And have fun.
David The Good is a Grow Network Change Maker, a gardening expert, and the author of five books you can find on Amazon: Compost Everything: The Good Guide to Extreme Composting, Grow or Die: The Good Guide to Survival Gardening, Totally Crazy Easy Florida Gardening, Create Your Own Florida Food Forest, and Push the Zone: The Good Guide to Growing Tropical Plants Beyond the Tropics. Find fresh gardening inspiration at his website TheSurvivalGardener.com and be sure to follow his popular YouTube channel.
I have some cucamelon vines that “volunteered” under our oaks (we have 20 in the front yard), and they’ve been growing very well there. Pineapple is also a very good suggestion, I want to try that.
I stole an idea out of push the zone,planted a young coconut creme maple on the northern edge of an oak trees canopy.. it’s not getting alot of light yet, but I’m gambling it will get more when the sun shifts in the spring… here’s hoping!
I have a huge rosemary bush, an even taller Ceanothus (Calif. native) and Fejoa, 20 ‘ from a very large old valley oak (Q. lobata) They are about 10 years old and get very little water and are great for bees, but the Fejoa (pineapple Guava) has flowers but no fruit due to lack of sunlight. I hardly ever water them even in our drought. Most oaks don’t like much water, unless they are growing where they can “choose” dry or wet, as along a creek. That’s why it is usually recommended not to plant water needing plants, such as most annuals, near oak trees.
I had a large grow bag toward the south side of the rosemary, which had good Bok Choi, which I watered a lot. The next season, every thing I planted in it just struggled. When I decided to move the planter bag, I found it was full of oak roots, coming up thru just one hole! There were also some small oak trees on a slope 10 ‘ down from the this area, so i don’t know which oak roots they were.
i would recommend planting perennial herbs that do not need a lot of water, around oaks, but not too close to the trunk. I like David’s idea of trying Asparagus as it would survive the frost here, but not the ginger in our climate.