How to Plant Grass Seed on Hard Dirt

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Newbie gardeners might be intimidated by soil with no give. After all, she is called Mother Earth for a reason–giving birth to life. Yet certain soils appear to forbid life much less yield new flora. There are reasons for hard soil and, better still, solutions.

In fact, many civilizations are credited with bringing forth agriculture when conditions were hostile. Subject to applied patience and persistence, arid and rocky terrain gave way to fertile and fruitful ground. If your own property is resisting a beautiful, green lawn, rest assured that you can soon learn how to plant grass seed on hard dirt.

Reasons for Hard Soil

Soil begins as bedrock that is heated, frozen, pulverized and reconstituted by the elements: wind, water, climate and chemistry. Ironically, that which gives it the power of life is, well, death. As plants and animals die and decompose, organic matter reacts with the pestled substratum to form soil as we know it. Yet the dirt continues to evolve in texture as clay, silt and sand particles dominate and recede.

Clay, of course, is the most dense texture whereas sand is the most porous. Unless you are trying to plant on bedrock itself, the secret of how to plant grass seed on hard dirt is the reduction of density. Dense soil can result from several variables.

Too Much Clay

Soil dominated by clay has its pros and cons. It maintains a high cation exchange capacity (CEC), i.e. it holds onto nutrients very efficiently. Once irrigated, it holds onto moisture very well but does not drain thoroughly at all. In addition, it is most prone to compaction. When deprived of water, it gets extremely hard.

Compaction

Whether sand, silt or clay (usually a combination of the three), soil contains another component without which it can not support life: pore space. Unless there is adequate pore space, water and oxygen can not move freely through the soil. Root structures are inhibited by too few pores. When soil suffers compaction, it loses the ability to foster growth. Tilling wet ground and heavy machinery are primary causes of compaction.

On the other hand–and counter-intuitively–over-tilling and supplementing clay with sand also aggravate this condition. Over-tillage makes dirt particles too small to allow for proper drainage. By the same token, adding sand to clay soils makes it more dense, not less. Knowing how to plant grass seed on hard dirt first means knowing what not to do.

Solutions to Dense and Compacted Soil

Letting Nature Take Its Course

topsoil

If the soil compaction is not severe, you can let patience dictate how to plant grass seed on hard dirt. Winter has a way of dealing with compaction density through the freeze-thaw cycle. Over time, molecules are loosened and more porous space develops. Again, this is a remedy only when the hardness is relatively shallow.

Plant Grasses Native to Wetlands

Wetland grasses contain specific enzymes that allow them tom grow normally in soil heavy with clay. Among the optimal ornamental grasses are switch grass, Canadian wild rye and fountain grass. Some of this flora not only survives well in clay, it also improves the soil texture as well as its drainage capacity. Grasses whose roots protrude straight down are known for this soil-enriching property.

Cover the Dirt with Mulch

Mulch–whether natural or synthetic–provides a variety of benefits to soil. In addition to insulating the bed against extreme heat and cold, mulch also helps to keep weeds out and to retain soil moisture. Beyond these, natural mulches feed the soil with organic matter as they decompose. This makes the soil particles aggregate, thereby increasing aeration. The resulting root development further enriches the formerly hardened layer.

Mulch may consist of bark, wood chips, sawdust, pine needles, straw or gravel. Plastic coverings are also used for this purpose. Most importantly, mulch should be spread evenly on fairly level ground. This gives the grower learning how to plant grass seed on hard dirt a fighting chance.

Aerate the Soil

People with heavy clay or otherwise compacted lawns often benefit from the aeration process. Aeration is simply the extraction of small, cylindrical cores of soil from the dirt and depositing them on the lawn. In so doing, the landscaper (or whomever) creates pore space and facilitates air circulation within the soil. It also serves to free up water and nutrient activity, as well. Root growth is better and pesticide/herbicides are less likely to run off. Aeration devices are commonly used but it is also possible to do with hand tools.

Amend the Soil

To amend the soil means to change its very character. For hard, dense and compacted soil, amendment makes it more porous and permeable for oxygen, water and nutrients. How does a planter achieve this? Adding organic or inorganic material is the usual method. Peat, manure and compost are common amendments that help to revive unproductive earth. Determining which material is most effective depends on the salt level, the soil texture and the acidity of the amendment.

Employ Deep Plowing

man plowing garden

Lawn caretakers, especially those with sustainability concerns, are hesitant to seek radical solutions. Yet knowing how to plant grass seed on hard dirt should include every option. Very deep tillage–up to five feet in depth–requires heavy-duty equipment like sub-soilers, trenchers and back-hoes. Needless to say, it is not a cheap investment. All the same, it is an avenue available for extremely stubborn ground.

Summing Up

As is evident, the answer to the question of how to plant grass seed on hard dirt is to deal first with the dirt. There are various ways to improve the condition of this growing medium: some simple, some more involved. At any rate, even the most compacted soil will respond to appropriate tending and amending. If perfect soil is not available (it rarely is), caretakers nevertheless have many tools at hand to improve an imperfect environment.

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Jonathan E. Bass
 

Graduated from Middle Tennessee State University. I am currently a gardener. I have a small garden behind my house. I love it.

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