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SKU 922055

Soil Treatment 25 lbs. Organic

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About This Product Revive 25 lbs. organic soil treatment granules are for adding to lawns and gardens. Composed of organic matter and fortifi...

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SKU 943685

Epsom Salt 7 lb. for Plant Nutrient

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About This Product Pennington Fast Acting Lime Plus AST goes to work right away to raise your soil pH. Low pH can cause moss and bare spots in your...

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SKU 718243

Earthworm Casting 12 lbs. Bag

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About This Product Our pure, screened, OMRI Listed earthworm castings are an excellent all natural organic soil amendment great for all indoo...

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SKU 105288

Spangnum Peat Moss 2 lbs.

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About This Product Grow stronger plants with Miracle-Gro Sphagnum Peat Moss. Enriched with Miracle-Gro Plant Food, the mix helps promote stro...

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SKU 228267

Growing Mix 2 cu.ft. all purpose

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About This Product Complete and ready to use this peat-based All Purpose Growing Mix is suitable for indoor and outdoor planting. It is offer...

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SKU 777869

Earthworm Casting 6 lbs. Bag

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About This Product Earthworm Castings Plant Food is an all organic soil amendment ideal for growers. Derived from earthworms, earthworm casti...

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SKU 850388

Pulverized Gypsum 40 lb. White Blend

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About This Product Classic Stone 40 lb. Gypsum Lawn and Garden Soil Softener helps improve soil conditions. Gypsum allows for a deep, healthy...

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SKU 409721

Growing Mix 2.2 cu.ft. with Mycorrhizae

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About This Product SunShine Mix #4 with Mycorrhizae is an ideal choice for both indoor and outdoor gardening. This high drainage mix is known...

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SKU 712987

Perlite Soil 8 qt.

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About This Product Help prevent soil compaction and promote strong root development with Miracle-Gro Perlite. Enriched with Miracle-Gro Plant...

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SKU 706398

Perlite Soil 2 cu.ft. Organic

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About This Product Perlite is a lightweight, organic soil amendment that can be used to improve drainage and aeration in potting mixes. Perli...

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Soil Amendments: What You Need to Know

Soil amendments, also known as enhancers, conditioners, or soil boosters, are used to improve soil structure, nutrient content, and water retention for healthier plant growth. This category includes organic and mineral-based materials such as earthworm castings, gypsum, moss, and perlite. Pack sizes range from 2 lbs. to 40 lbs., and include both loose and compressed options designed for use in lawns, gardens, and potting environments.

Type:

  • Earthworm Casting: Organic material created from decomposed plant matter processed by earthworms. Packed with natural nutrients and microbial life, castings enhance soil fertility and structure without synthetic additives.
  • Epsom Salt: A natural source of magnesium and sulfur, Epsom salt is used to correct soil deficiencies, improve plant color, and increase flower and fruit production. Often applied to roses, tomatoes, and lawns.
  • Growing Mix: All-purpose growing blends designed for direct planting or seed starting. These mixes often include components like mycorrhizae and peat for improved root development and water management.
  • Gypsum: A soil softener used to break up heavy clay soils and improve drainage. Gypsum also adds calcium and sulfur without altering soil pH, making it suitable for both lawns and garden beds.
  • Moss: Sphagnum and sheet mosses are ideal for water retention and top dressing. Often used in terrariums, decorative containers, or as protective mulch in plant pots.
  • Perlite Soil: Lightweight and porous, perlite improves aeration and drainage when mixed into soil. Commonly used in seed starting, container gardening, and hydroponic setups.
  • Soil Treatment: Pre-mixed amendments formulated to restore depleted soils or support new planting. These blends may include composted organics, minerals, and soil conditioners in one ready-to-use format.

At Supply Ontime, we offer reliable materials designed to meet your project’s needs. With same-day delivery across the Greater Los Angeles area, we make it easy to keep your projects on schedule. Order Soil Amendments now and get them delivered today!

Soil Amendments FAQ

What delivery options does Supply Ontime offer for soil amendments in Los Angeles?

We make getting amendments simple across Los Angeles County. Most listed items show same-day delivery or you can book a scheduled 2-hour window to match your project timing. Orders are delivered curbside or to your jobsite/community garden entrance, and you can bundle multiple products—gypsum, castings, growing mix, peat moss, and more—into one drop. Stock status is shown on each product page so you can plan confidently. If you’re coordinating crews or weekend projects, reserve a time slot and we’ll handle the hand-off so your LA build or planting day stays on track.

Which soil amendments work best for Los Angeles’ clay-heavy, alkaline soils?

Many LA yards have compacted, alkaline clay that struggles with drainage and nutrient uptake. Gypsum helps flocculate clay and displace excess sodium, improving structure without changing pH. Earthworm castings add biology that boosts root growth and nutrient availability. For containers and raised beds, use growing mixes with peat moss or coir plus perlite for water-holding and aeration—important in our long, dry summers. Epsom salt (magnesium sulfate) can help specific magnesium-hungry plants like peppers and roses but should be used only when a deficiency is suspected. Supply Ontime stocks these staples so you can tune soils for Mediterranean-climate gardening in Los Angeles.

How should I apply gypsum, earthworm castings, and Epsom salt in Los Angeles?

Always follow the product label, but here are common practices for Southern California soils: For lawns and clay-heavy areas, gypsum is often applied at 20–40 lbs per 1,000 sq. ft. and watered in thoroughly to improve soil structure. For vegetables and ornamentals, apply ½–1 inch of earthworm castings as a top-dress or blend 10–20% into potting mixes. Use Epsom salt sparingly—about 1 tablespoon per gallon of water—as a drench only when magnesium deficiency is present. Supply Ontime stocks 40-lb gypsum bags, 6–12 lb castings, and 7-lb Epsom salt, making it easy to size applications for raised beds, containers, and landscape beds across Los Angeles.

Are these amendments safe for edible gardens and water-wise landscapes in LA?

Yes—when used as directed. Earthworm castings and gypsum are natural options widely used in vegetable beds, fruit trees, and lawns. Castings add beneficial microbes without burning plants; gypsum supplies calcium and improves soil structure without raising pH. For drought-conscious planting, mixes that blend peat/coir with perlite help retain moisture while preventing waterlogging—useful during LA’s hot, dry spells. Epsom salt is also food-safe, but should be applied only to address documented magnesium needs. Choose organic-leaning blends where desired and irrigate efficiently (mulch, drip lines) to make every pound of amendment work harder in Los Angeles conditions.