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Can I Grow Food Organically on a Sand Dune?

31 December, 2020 by amygwh

Leafy loose heads of green chicories. The green leaves have slight variegations of red and purple.

This past summer, I was told by a farmer at a local farmer’s market that growing food organically is impossible here on the Mississippi Gulf Coast. However, I have found that to be not precisely true.

What is true is that my organically-managed garden is supplying a small but steady flow of veggies to the kitchen. What is also true is that a lot of those veggies have been eggplants and okra. As long as I love eggplants and okra, my summer veggie garden will be a smashing success. Ditto for radishes in the spring and fall.

Gulf coast early fall harvest of okra, peppers, greens, and one winter radish.

Unlike market farmers, home gardeners like me have the benefit of not needing to compete with the produce section of the local supermarket. We don’t expect our gardens to supply all the standard veggies the whole year round. This means we can focus our efforts on crops that don’t need chemical interventions to produce food in our yards.

It can also help if a gardener is a bit flexible in how to measure success in the garden.

Part of the path to success is identifying which exact crops will produce well in our gardens, then growing and appreciating those crops. Another part of the path is to keep in mind the part of the Serenity Prayer that reminds us to not get too fussed about the “things I cannot change” and focusing instead on knowing which things can be changed and which can’t.

My sand-dune-based garden

This Gulf Coast sand dune, 28 feet above sea level in plant hardiness zone 9a, is very different from the location of my previous 30 years of gardening in the red clay of the Georgia Piedmont region in hardiness zone 7b. In the “things that cannot be changed” category, the soil here is, as mentioned already, mostly sand. I can pile compost on top of it, but I cannot change the basic sandiness of the yard. I also cannot add more cold to our winters, which means some plants that need a lot of cold, like Rhubarb and many varieties of apples, will not thrive here. The flip side of that is that now I can grow some sub-tropical fruits.

Radishes pulled from the garden, with leaves still attached. Some radishes are round and red, some round and purple, some long and red.
November radishes, three kinds.

Many crops are more adaptable than Rhubarb and cold-loving fruits, especially the annuals that I usually grow in the garden. In our move from Georgia last spring, I brought seed packets for some of those crops left over from the past couple of years. Some of those crop varieties have worked well, and some haven’t.

I’ve already noted that eggplants, okra, and radishes have been wildly productive here. However, a whole lot of crops have been less happy here on my sand dune.

A sadness of beans

Bean crops, which always totally rocked the garden in north Georgia, have not done well here. The first planting gave us a few handfuls of beans, not the usual superabundance, before they died, and I was puzzled, but planted more. When the next planting died, I had to start thinking harder about what could be wrong. English peas planted in early fall met the same fate as the second sad planting of beans. They just faded away.

I can see a few possible reasons for the problem. One is a lack of some essential nutrient, and another is a high soluble salt content in the soil. Until I can deliver a soil sample to the state testing lab, those are both just guesses.

A third possible reason is the relatively high pH of my sandy soil, which is way above 7. Beans tend to prefer a lower pH. This year, as I prepare the planting beds, I will be digging in some sulfur to start bringing that down (sulfur can take years to have any effect). In addition, I hope to hunt up some gypsum to use for a calcium source, since that can also help alleviate the high pH — and it might help with the soluble salts, too.

There is a good chance that I can change the soil pH a little bit, and I can amend the soil to bring in missing nutrients. I might not be able to do much about soluble salts, since my garden is only five blocks from the beach. Salt is in the air! If salts are the problem, beans may never do well here. It will be interesting to find out.

Every crop turns a bit yellow as it grows

As my summer crops grew this year, I saw that they all became less richly green over time. Back in north Georgia, a little bit of Epsom salts (an affiliate link to the product), a source of soluble magnesium, would fix that when extra nitrogen (like in a fish-based fertilizer — see article at this link) didn’t seem to help.

I discovered that Epsom salts works here, too, but they need to be applied much more frequently. The sandy “soil” lets dissolved nutrients, like the magnesium in Epsom salts, wash away, down out of the root zone, very quickly. Clay soils, like those in north Georgia, hold on to nutrients much more tightly, keeping them up in the root zone longer.

This summer, I ended up needing to apply a weak solution of Epsom salts (two rounded tablespoons dissolved in two gallons of water, then applied as evenly as I could manage over two 3×12 foot beds) every couple of weeks to keep the plants looking healthy. For my fall crops, this schedule stretched out to 3-to-4 weeks.

One item on my “to purchase” list this spring is a big bag of a crushed-rock-magnesium source that will not wash down through the sand so quickly. Big, gravel-sized chunks are my preference, but more finely pulverized products are easier to find. I am considering Sul-Po-Mag and Azomite (two affiliate links) as possible sources.

With some additional research into sources and work in applying what I’ve found to the garden, there is a good chance that I can fix the low-magnesium problem.

Other crops that grew less well than preferred

My corn patch was a bust. We ended up with a few patchy ears of sweet corn, which was a disappointment. I think the cause was a mineral-nutrient deficiency problem. I plan to try again this coming year after amending the soil more intensively (I had added a lot of purchased compost this past spring.)

Zucchini squash was very productive for a very short time, then was killed off by squash vine borers. The winter squash did not do well at all. I had planted a butternut, which can withstand the borers, but the squashes that the plants produced were tiny. Then, the leaves all got mildewed and the plants died. For winter squashes, I will — again — keep working to improve the soil with composts and mineral amendments and also try some different varieties. I know that ‘Seminole’ pumpkin squash should do well here, but I am hoping for something thicker-fleshed, sweeter, and with a shell that won’t require a sledgehammer to break through (I have grown it before…).

Sweet potatoes were not nearly as productive as I would have preferred. The good news is that I did dig up about 20 pounds of sweets from the garden. My experience in north Georgia, though, shows me that a much larger harvest is possible from the number of plants grown. From similar space and number of plants in Georgia, the harvest was typically twice that amount.

Tomatoes from the fall plants, brought inside in late November.

Tomatoes in the spring were not very productive. A couple of plants just plain died (drowned, when the garden flooded) and the rest quit making fruit in mid-summer. Apparently, that is a normal occurrence here, caused by nighttime high temperatures. The late-summer tomatoes that I grew were only just beginning to ripen before our first frost on the last night of November.

These tomato issues can be fixed (I hope) with changes in the timing of my plantings. Luckily, this year I am already here, and the garden beds are dug, so I should be able to get tomato plants into the ground well before April. (Our last frost should be around the end of February.) Last year, I was just starting to prepare the garden beds in April, because we moved here at the end of March.

Beets have been a bust. I planted one set of seeds in the late summer, and they came up, but then the little plants faded away. A second planting produced more little plants, and most of them are still present, but they have not grown much.

Stink bugs! Caterpillars!

In addition to soil problems, there were some pests. This is not really a surprise, since tiny plant-eaters are everywhere. My two largest categories of pests were stink bugs and their relatives, and caterpillars of several species.

Immature leaf-footed bugs, the nymph stage, on Southern peas.

Stink bugs and leaf-footed bugs damaged tomatoes, peppers, and the Southern peas. Most evenings beginning in early summer, I spent a few minutes out in the garden with a large plastic cup of soapy water, hunting for these pests. A whole platoon of immature leaf-footed bugs could be dislodged into “the cup of doom”, where they would drown, with one shake of the bean, leaf, tomato, or pepper on which they were gathered.

Caterpillars plagued the garden until late summer. Every leafy green vegetable that is normally recommended for the summer garden was attacked, in addition to tomatoes and peppers. Weirdly, though, the caterpillars that I expected to see on cabbage-family plants in fall never appeared. My kale, collards, and arugula have been unmolested. I count this as a blessing.

Fire ants

Fire ant mounds were all over the yard when we moved in. It took awhile for me to get around to dealing with them, but I did find that the Texas A&M recipe, noted in my second article on fire ants, that uses Medina Orange Oil (affiliate link) and Blue Dawn dish soap works great here. Smaller mounds were destroyed with one treatment. Larger mounds took two or three tries. As new colonies have moved in, I have continued using the DIY recipe. This recipe is not strictly organic, considering the range of ingredients in the Blue Dawn dish soap. When my giant bottle of Blue Dawn is finally empty, I plan to try using liquid castile soap, which does not include the petrochemical ingredients, as a replacement for the dish soap.

Before I started seriously hunting down and destroying the fire ant colonies, the ants were eating okra in the garden. It was a surprise that the ants on the okra really were fire ants, not like the kind of ants back in Georgia that farmed aphids on the okra. Figuring this out was painful. Welts from fire ant bites/stings take a long time to heal.

Some happier crops

Plenty of crops have done pretty well in my sand dune garden. Here are some happy pictures of examples:

  • Zinnias and butterflies
  • Tobasco peppers, fresh and dried
  • Chicories and carrots
  • Winter radishes, a favorite
  • The arugula patch
  • Sunflower and native bees
Successes!

The plan for now

One great feature of this garden is that digging holes and creating new planting beds is much easier than in the clay in north Georgia. Even better, wet sand never sticks to the shovel in huge messy globs like the red clay can. However, the big drawback is that the sand doesn’t hold onto much of anything. Water and nutrients — like from fertilizers — wash right through.

To improve this situation, I will keep adding composts — my own compost pile is far enough along to reduce the amount I need to buy this year. In addition, I will be buying those crushed rock sources of nutrients, to improve the health and productivity of my crops, as noted above. These additions should make organic gardening in the sand more successful.

In future posts (I promise, they will be more frequent in the coming year), there will be more information about the actual plants in the garden.

I hope that your gardening has provided good food through 2020, and that the coming year brings more garden adventures and successes! Keep well.

Filed Under: organic gardening, Soil fertility Tagged With: coastal garden, epsom salts, fire ants, garden magnesium, pest control, sandy soils

Fire Ants in the Garden – Part 2

23 October, 2017 by amygwh

Fire ant mound at the base of a tree.

How well do organic methods of getting rid of fire ants work? Like other organic pest control methods, the options available are variably successful, and most need to be repeated to get really good results.

University of Florida has posted that the boiling water method has a 20-60% success rate. Repeat applications improve success, but there is a reminder that boiling hot water kills nearby plants, too, and will need to be used with caution.

University of Texas Extension personnel have done some preliminary research on homeowner options for getting rid of fire ants. They compared a chemical control, a DIY recipe for a mound drench that contains orange oil (d-Limonene), a sesame-oil based product (organic), and a drench of just plain water — not boiling.

It is not super-surprising that the chemical control worked best, but the the DIY orange-oil recipe worked pretty well, too. The sesame-oil based product worked to a much lesser extent, but definitely showed some control action when compared to the plain water treatment.

The success of the organic products is good news for organic gardeners.

If you want to try the University of Texas orange oil recipe for organic fire ant control, here it is:

1.5 fl oz Medina® Orange Oil and 3 fl oz Dawn® Soap/ gal water per mound.

In addition to working pretty well, using the orange oil recipe did not kill nearby plants. That is something that gardeners all will be glad to hear!

Would you like to know what doesn’t work, according to the University of Florida? Grits, club soda, soap, wood ashes, and shoveling mounds together.

Filed Under: Bugs and Other Insects Tagged With: fire ants, organic garden, pest control

Fire Ants in the Garden – Organic Control

18 October, 2017 by amygwh

Fire ant mound at the base of a tree.

No gardener wants to encounter fire ants in the garden, but sometimes we find that they have moved in, unwanted. Getting rid of these pain-inflicting invaders can take some persistence, but options for organic control do exist. Knowing a little about the biology of these ants can help a gardener plan a successful counter-attack.

Flattened fire ant mound with deer hoof print in the middle.
Flattened fire ant “mound” shows deer hoof print. PHOTO/Amygwh

Fire ants do not tolerate freezing weather very well. If you treat a fire ant mound in fall, even if the whole mound isn’t dead within a few weeks, enough workers can be killed that the rest of the colony doesn’t survive the winter.

In spring and fall, too, most of the ants in a colony will be closer to the surface, so that a mound drench type of product has a good chance of reaching all of them.

In other words, both fall and spring are when organic controls are more likely to work well. Killing off smaller colonies in fall will also reduce the number of new colonies next spring, when mated queens that survived the winter will fly off to start new colonies.

The very first control to try, though, doesn’t use any products at all. On a cool day after a rain (when more ants are nearer the surface), pour a few gallons of boiling water on the mound, starting by circling the mound a foot or so away and then pouring the rest right on the mound. If this doesn’t kill the whole colony, move on to “Plan B”, a purchased mound-drench or a bait. (NOTE: Boiling hot water can burn people when accidentally spilled, and it will also kill plants near the mound it is being poured on. Please handle boiling water carefully, and do not use it near trees, shrubs, perennials, bulbs, or other desired plants.)

Another option is called “bucketing”. You gather up a few buckets, dust the inside with talcum powder or corn starch (to keep the ants in), and on a cool morning dig quickly into the mound, dumping shovels full of dirt into your buckets. Dig deep enough to find the bottom of the mound. Add a generous squirt of dish soap to each bucket, and add water to drown the ants. This works on small mounds, but not on old, deep colonies.

Organic-approved products for killing fire ants typically contain either d-Limonene (from orange oil) or a spinosad compound (from special bacteria) as their active ingredients.

One organic produce that contains d-Limonene, to be used as a drench, is Orange Guard Fire Ant Control. The d-Limonene products have worked pretty well in our area community gardens.

An organic product for fire ant control that uses spinosad as the active ingredient is Captain Jack’s Dead Bug Brew by Bonide. Instructions for using it as a mound drench are pretty far down the label, but they are there.

Whatever product you choose, be sure to follow package directions carefully.

Remember to NOT disturb a mound in any way before using a product on or around the mound. If the ants are disturbed, they go into “defense mode”; a whole lot of ants will boil up out of the mound where they can’t be reached by a drench.

Fire ants are not easy to eradicate, and new colonies will continue to move in from surrounding areas if they can, even when old colonies are killed off. It is their way.

However, gardeners can be persistent, too. Knowing the best times to work on the mounds for best effect helps keep our gardens fire-ant free.

For more information and the recipe for a DIY orange-oil-based soil drench, see Fire Ants in the Garden, Part 2.

Filed Under: Bugs and Other Insects, organic pest control Tagged With: Community Gardens, fall garden, fire ants, pest control

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