Return to the Gulf Coast Gardening Forum | Post a Follow-Up

Regarding clay....

Posted by Panoply76 8 (My Page) on
Wed, May 22, 13 at 15:19

The soil I have to work with is just about solid clay about a foot down. So drainage is a huge problem not to mention clay being pretty crapy for growing anything.
Are there ways to deal with this? I mean, I suppose I could shell out big bucks and have a backhoe dig out a large amount of dirt and then refill it with better soil, but something short of that is there hope?
Do any plants LIKE clay? My garden is a butterfly and hummingbird garden so I'm looking for plants that atract them. Anyone know a plant that can tolerate clay, the poor drainage of clay AND attract butterflies and/or hummingbirds?


Follow-Up Postings:

RE: Regarding clay....

Nothing like Gulf Coast gumbo clays to challenge a gardener. There are a number of approaches, but which to follow depends a good bit on what you want to plant and grow.

First - forget about digging out and filling in with a more desirable soil. That will leave you what many refer to as a bathtub. Basically you will have a clay tub filled with nice soil. The when you irrigate or get substantial rainfall, the tub will fill with water. It's not a good scenario for long-term plantings.

For permanent installations it is generally best to plant species well suited to the native soils, and there are many. Just look around and they will become evident. A second choice is raised beds. But most perennials will still want to root and grow at depths beyond the common raised bed depth. So again, plants well suited to the native sois are your best bet.

You can improve your heavy clay soils by incorporating a fair amount of organic matter (compost, etc.), up to 10% by volume in the first 6" of soil. Then follow with a 4" layer of a wood-based mulch on top after planting. Add new mulch periodically to keep at least a 2" layer on top. Over time the clay soil beneath will become better.

For annual plantings of flowers, veggies, etc., raised beds with more highly amended soils or imported "garden soils" work well. The key here is enough depth, and to build them on top of the natural grade. That way you end up with a false bottom tub, and the water not only drains through the bed soil, but away as it hits the clay beneath.

For annual plantings TAMU recommends the addition of 3" of expanded shale tilled into the top 6" of soil (produces a 3" raised bed), then followed with 3" of compost tilled in on top of that the new 6" depth for a 6" raised bed (see link below).

Here is a link that might be useful: Expanded Shale - A new Possibility for Amending Clay Soils

RE: Regarding clay....

Don't know why I didn't notice this before. I totally agree with the above, just keep putting OM on the surface when it presents itself. Leaves, lawn mower bag, small yard trimmings, kitchen waste buried slightly so it doesn't harbor fruit flies, mulch, pine needles, home made compost, anything you can get/find. The drainage will improve, as well as water retention in dry times. Similar to reclaiming an area from grass/weeds via smothering/lasagna.

This works in clay (in housing developments where I lived in OH, they take all of the top soil away to sell, then build the neighborhood,) and in sandy, won't-hold-moisture "soil" that I have here. I've never had any issues with bath-tubbing this way (but have created such situations amending holes for larger, woody individuals installed mid-lawn,) in a bed because the surface and below isn't disturbed, which through experience I know is unnecessary if one is patient in not expecting instant results. The forest floor is a beautiful rich loam, with lots of humus and tilth, from layer after layer of decomposing OM landing on its' surface. The worms and other decomposing entities will, along with rain, distribute the by-products to their proper levels in the soil, as well as your digging here'n'there occasionally to add/move plants.

After just a few months of being covered with decomposing OM, a difference will be apparent. After a year, digging will be noticeably easier, the color different. After 2 years, there should be little trouble with drought or flood, depending on the surrounding topography and weather. Compared to areas that were tilled to start, I can't tell a difference when I 'dig in' after 2 years. It's one of the most addictive parts of gardening, to me, improving the soil, then observing those improvements.

Just remember that no 2 gardeners do everything the exact same way although both may have great plants. Gardening usually goes more right than wrong, and you have to pick the ideas and methods that work for you, your schedule, budget, climate, what's actually available for free or sale at stores, and just sounds like something you can do. Some of the stuff I read sounds like it would work great, but I just don't want to do it, or can't envision how it would benefit. I've learned that if I approach something about gardening with confidence, it usually works. If I'm hesitant and doubtful, haven't asked for enough opinions usually, it usually doesn't go well. My Mom and I have usually opposite opinions about any garden-related issue or topic, and her yard looks fine, so does mine, each according to their own taste. I wouldn't want her yard and she wouldn't want mine.

Going back to individual plants, Lantana could care less about any of this soil improvement, whether you do anything or not, so a good one to start with. Buddleia seems happy anywhere I stick a piece, sometimes in the middle of grass. Cannas are easy, but give them a spot you mow around, or has a border (like a wall,) so they don't creep into other plants. Angelonia (likely killed by winter but so worthwhile) also won't mind 'crappy dirt.'

Some other annuals/house plants that don't get enough attention for their attraction to these visitors... Basil, Coleus, Pentas, any Plectranthus flowers, Zinnias.

From the selection of plants I enjoy looking at, I try to choose those that also appeal to butterflies and hummingbirds. We have a ton of both currently hanging around, well worth the efforts.

So what did you decide to do? How is it going so far this year?

RE: Regarding clay....

Just saw that you kind of asked the same thing twice. Hope one version of what I said is helpful/applicable in some way. Yes, I really do like to yak about dirt...

RE: Regarding clay....

Moving to South Tx. from Pennsylvania has presented quite a challenge in gardening. I'm used to the regular soft soil, now all I have is several ft of this rock hard clay. I have done a little research & it says to try & ammend the soil by adding compost, & hummus. I did that with some top soil & 2 " of Mulch. So far I have only planted some Hostas, & Japonicas & a Split leaf phillodendrun. This is only late February and the weather hasn't quite settled yet. Keep you guys posted how I made out.

RE: Regarding clay....

Well, I love to yak about dirt too, purpleinopp. I love turning crappy dirt into beautiful crumbled fluffy chocolate cake.

I live in St. Tammany and I have poor soil. My test showed low in EVERY nutrient, with very acid reaction 4.7PH and low low organic matter 1.7%. However, I have been able to substantially improve certain areas over time. I recently watched a video on the internet called "Back to Eden" (you can search on youtube and watch it for free) where a gardener in the Pacific Northwest advocates transforming the soil without tilling by layering organic matter over the soil year after year. He specifically uses ground up tree trimmings (like from electric company line trimmings) followed up with manure (he has chickens - but also horse manure is mentioned in the film). Every year he adds a new layer and the dirt in his yard was amazing.

I used to dig out all of my clay and replace with new soil. This worked OK if you created a large bed, but it was very expensive and back-breaking. So I converted to a sort of no-till. I got a huge load of tree trimmings thanks to the electric company last year and covered all of my beds with this material thickly. I notice after several months there are worms EVERYWHERE where I laid the trimmings and the soil is much softer and darker. It takes a long time but if you can get tree trimmings or find a source of horse manure, get a huge load in Spring and Fall and spread a 2-3 inch or more layer in all of your beds and faster than you think that clay will start to change into beautiful dirt.

In 2-3 seasons you should have some nice stuff, and if you keep it up after 5-7 years you will have amazing dirt. We are so hot and rainy here that organic matter breaks down exceedingly fast and must be replaced to keep the soil productive. So just keep layering that organic matter.

 o Post a Follow-Up

Please Note: Only registered members are able to post messages to this forum.

    If you are a member, please log in.

    If you aren't yet a member, join now!

Return to the Gulf Coast Gardening Forum

Information about Posting

  • You must be logged in to post a message. Once you are logged in, a posting window will appear at the bottom of the messages. If you are not a member, please register for an account.
  • Posting is a two-step process. Once you have composed your message, you will be taken to the preview page. You will then have a chance to review your post, make changes and upload photos.
  • After posting your message, you may need to refresh the forum page in order to see it.
  • Before posting copyrighted material, please read about Copyright and Fair Use.
  • We have a strict no-advertising policy!
  • If you would like to practice posting or uploading photos, please visit our Test forum.
  • If you need assistance, please Contact Us and we will be happy to help.

Learn more about in-text links on this page here