Home & Garden
Tips to improve your home garden soil
- Page development: Dustin Blakey
- For local advice: Find your local UC Master Gardeners
Practices to improve your garden soil
Fertilizer; Compost, mulch and more
Home garden soils (vegetable, lawn and flower gardens) often face problems of
Sometimes problems occur because infertile subsoil is brought to the surface during home construction.
If well-adapted species are selected for the landscape then Woody plants (including trees and shrubs) tend to have fewer soil challenges than other home garden uses.
There’s a problem with my plants.
- Many nutrient deficiencies cause yellowing or discoloration of plants.
- If the plant is deformed or dead, it's likely not a soil problem (unless you killed it through lack of water!)
Still think the issue is with your soil?
For more: Want to understand your soil more?
Explore Soil Doctor (Bell)
Know your soils Fact sheet (Ingles)
What's my soil? Soil web (T O’Geen) is a remarkable resource showing soil types throughout California with detailed information on soil characteristics and potential uses.
Practices to improve your garden soil
- Adjust Soil pH
- Check your soil texture
- Raised beds (for problem soils)
- Add Soil Amendments
- Compost, mulch and more
- Eeeck Bugs
- Water & Irrigation
Is my soil pH okay?
For most plants, a soil pH between 5.5 and 7.5 is okay. (pH is basically the measure of the amount of acid or base in the soil)
See how nutrient availability and microbe activity vary with pH (Figure from Fairway Green Inc)
Note: Some indicator plants can help diagnose soil pH characteristics (e.g., Marigolds - get Fe and Mn toxicity at low pH; Petunias - show Fe chlorosis at high pH).
Want more? See "What is pH and Why do we care" Fact sheet
How do I measure my soil pH?
There are a number of pH measuring devices sold at garden shops (See some common types of pH meters - with outdated costs).
Many pH measuring devices are not very accurate although they can give a general indication of whether you are near an extreme.
pH litmus Paper is usually okay.
If you want an accurate measure, you may need to send your soil sample to a lab or get an upscale pH meter. (see Basics and Soil Sampling for more)
How can I fix my soil pH?
Is soil pH a problem Fact Sheet (Blakey)
Note that your actions depend on soil texture because a clay has more buffering than a sand. A such, a clay needs more additive to change its pH.
If pH > 8 (alkaline) One option is to add Sulfur - how much, when?
if pH < 6 (acid) - one option is to apply lime. how much, when?)
How do I estimate soil texture
Estimating soil texture by feel Video (Madden)
Estimating soil texture by feel Fact sheet (Ilaco)
Soil stability test video (NRCS) (1:13)
How do I interpret soil texture
- Sandy soils have low available water and few nutrients
- Loam soils (a mix of sand, silt and clay) are the best for water and nutrients
- Clay soils hold lots of everything - but they hold water really tightly. As a result, a heavy clay might actually have more total water in it than a loam, but less of the water is available to the plant. Clays also may waterlog or have slow infiltration. Further, there ar two different types of clay soils. Swelling clays are typically richer than the non-swelling types.
What can I do
In summary, virtually all soils benefit if you add compost, mulch and/or manure.
Gardening and landscaping in hard pan soils Fact Sheet
Managing clay soils Fact Sheet
Use when your existing soil is really problematic (e.g., very poor drainage, salty, rocky, etc.), or
Use for convenience and/or appearances (Raised beds can look nice and neat!).
Raised Beds Fact sheet (Blakey)
Lawns web (UC IPM)
Vegetable garden Fact sheet
Site preparation web (UC IPM)
Soils where you plant woody pants. Grow the right plant in the right place. (See UC Master Gardeners)
Why use amendments?
- Garden soils. Soil amendments (such as mulch, compost) are the most common and promising option to build soil health and improve the soil tilth of home garden soils.
- Fertilizer - Plants get their nutrients from the soil and from added amendments (like compost or manure, or fertilizer etc.). Some nutrients might also come in the water.
- Mulch - (almost) anything that goes on the surface - is good for reducing soil evaporation and suppressing weeds.
- Compost - decomposed organic matter added to the soil - is good for soil microbes, for building soil organic matter and for supplying nutrients.
What are the different types of amendments?
Mulch? Compost? Fertilizer? What's in the different products? Fact sheet
Amendment options Web (Orange county)
Making compost Fact Sheet (from Sac Master Gardeners)
Compost in a Hurry Fact Sheet (Geisel and Unruh)
Problems making compost? Fact Sheet
How much mulch do I need (for water and weeds)? Fact Sheet
Mulches for landscapes Fact sheet
Note: Many people over-fertilize
Nutrient needs for vegetables and other plants web (UC Master Gardener) or
Nutrient needs for vegetables web (UC IPM).
Converting lb/ac for my small garden Fact sheet
How about worms?
What do worms eat video (UC MG)
DIY worm bin video (UC MG)
Harvesting worm castings and leachate video (UC MG)
How big is my yard?
How to estimate the area of your yard video (Dustin Blakey)
Food safety concerns
Compost and manure Food safety Fact sheets (Fake and Marini)
What can I do about bugs and diseases in the soil?
Check for soil bugs or diseases web (UC IPM garden)
Soil solarization, a non-chemical method to control disease and insect soil pests. (UC IPM)
Are you over-watering
How are you watering - hand watering often leads to too much
Calculate your water needs and how long you should water. Calculator for watering needs
How wet is my soil? Do I need to water?
How wet is my soils (Fact sheet)
Should I water? (video)
What can I do?
Water requirement for landscapes (Center for landscape and Urban Hort)
Use drip irrigation Home gardens Fact sheet (Sonoma UC MG)
Understanding your residential water bill (Fact sheet)
- UC ANR Alameda County
- UC ANR Inyo/Mono County
- UC ANR Orange County
- UC ANR Urban Agriculture
- UC Master Gardener