pH Preferences

Trees, Shrubs, Vegetables, and Flowers

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An accurate soil test will indicate your soil's pH level will specify the amount of lime or sulfur that is needed to bring it up or down to the appropriate level. A pH of 6.5 is just about right for most home gardens, since most plants thrive in the 6.0 to 7.0 (slightly acidic to neutral) range. Some plants (blueberries, azaleas) prefer more strongly acidic soil, while a few (ferns, asparagus) do best in soil that is neutral to slightly alkaline. Acidic (sour) soil is counteracted by applying finely ground limestone, and alkaline (sweet) soil is treated with gypsum (calcium sulfate) or ground sulfur.

Common Name Optimum pH Range
Trees and Shrubs
Apple 5.0-6.5
Ash 6.0-7.5
Azalea 4.5-6.0
Basswood 6.0-7.5
Beautybush 6.0-7.5
Birch 5.0-6.5
Blackberry 5.0-6.0
Blueberry 4.0-6.0
Boxwood 6.0-7.5
Cherry, sour 6.0-7.0
Chestnut 5.0-6.5
Crab apple 6.0-7.5
Dogwood 5.0-7.0
Elder, box 6.0-8.0
Fir, balsam 5.0-6.0
Fir, Douglas 6.0-7.0
Hemlock 5.0-6.0
Hydrangea, blue-flowered 4.0-5.0
Hydrangea, pink-flowered 6.0-7.0
Juniper 5.0-6.0
Laurel, mountain 4.5-6.0
Lemon 6.0-7.5
Lilac 6.0-7.5
Maple, sugar 6.0-7.5
Oak, white 5.0-6.5
Orange 6.0-7.5
Peach 6.0-7.0
Pear 6.0-7.5
Pecan 6.4-8.0
Pine, red 5.0-6.0
Pine, white 4.5-6.0
Plum 6.0-8.0
Raspberry, red 5.5-7.0
Rhododendron 4.5-6.0
Spruce 5.0-6.0
Walnut, black 6.0-8.0
Willow 6.0-8.0
Vegetables
Asparagus 6.0-8.0
Bean, pole 6.0-7.5
Beet 6.0-7.5
Broccoli 6.0-7.0
Brussels sprout 6.0-7.5
Cabbage 6.0-7.0
Carrot 5.5-7.0
Cauliflower 5.5-7.5
Celery 5.8-7.0
Chive 6.0-7.0
Cucumber 5.5-7.0
Garlic 5.5-8.0
Kale 6.0-7.5
Lettuce 6.0-7.0
Pea, sweet 6.0-7.5
Pepper, sweet 5.5-7.0
Potato 4.8-6.5
Pumpkin 5.5-7.5
Radish 6.0-7.0
Spinach 6.0-7.5
Squash, crookneck 6.0-7.5
Squash, Hubbard 5.5-7.0
Tomato 5.5-7.5
Flowers
Alyssum 6.0-7.5
Aster, New England 6.0-8.0
Baby's breath 6.0-7.0
Bachelor's button 6.0-7.5
Bee balm 6.0-7.5
Begonia 5.5-7.0
Black-eyed Susan 5.5-7.0
Bleeding heart 6.0-7.5
Canna 6.0-8.0
Carnation 6.0-7.0
Chrysanthemum 6.0-7.5
Clematis 5.5-7.0
Coleus 6.0-7.0
Coneflower, purple 5.0-7.5
Cosmos 5.0-8.0
Crocus 6.0-8.0
Daffodil 6.0-6.5
Dahlia 6.0-7.5
Daisy, Shasta 6.0-8.0
Daylily 6.0-8.0
Delphinium 6.0-7.5
Foxglove 6.0-7.5
Geranium 6.0-8.0
Gladiolus 5.0-7.0
Hibiscus 6.0-8.0
Hollyhock 6.0-8.0
Hyacinth 6.5-7.5
Iris, blue flag 5.0-7.5
Lily-of-the-valley 4.5-6.0
Lupine 5.0-6.5
Marigold 5.5-7.5
Morning glory 6.0-7.5
Narcissus, trumpet 5.5-6.5
Nasturtium 5.5-7.5
Pansy 5.5-6.5
Peony 6.0-7.5
Petunia 6.0-7.5
Phlox, summer 6.0-8.0
Poppy, oriental 6.0-7.5
Rose, hybrid tea 5.5-7.0
Rose, rugosa 6.0-7.0
Snapdragon 5.5-7.0
Sunflower 6.0-7.5
Tulip 6.0-7.0
Zinnia 5.5-7.0

 

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Comments

hi ther have done a ph test

By nathan2011

hi ther have done a ph test to my soil an its come back at 7.0 an other places on the plot are 6.5 i have some veg that is between 6.0 an 7.0 wich area would i be best to plant them in higher end of plants ph or the lower end of ther ph for the best yield

In Oct. I placed my own

By Kathy T.

In Oct. I placed my own composit on my Raspberry plants. Then in Nov, spread some pine needles on the bed. I have some Manure in a bag from the store. Would it be safe to spread a little of that also? I have had a decrease in my rasp. production in the last few years so I have been trying to figure out what the cause is. I would appreciate any help. Also how can I have the soil tested?

well I put fresh manure in my

By charlie russell

well I put fresh manure in my compost but this manure you got its already composted if your not sour how munch manure to put around your plants send me an e-mail and if you got any questions on composting ask me my e- mail address is charlierussell526@gmail.com if you don't have an e-mail address well just reply

Hi My garden soil is very

By Wessie van der Westhuizen on March 26

Hi
My garden soil is very sweet.
I want to plant Prorea plants which need a sour soil.
What can I do to change my garden soil to be sour?

Your assistance will be appreciated.

Regards
Wessie

You can use a proper mixture

By Brandon Schulte on April 18

You can use a proper mixture of white vinegar and water to boost the acidity of your soil or you can add pure sphagnum peat which has a very low ph. Blueberry bushes thrive in low ph and are suggested to be planted in pure peat. So this should remedy you ph issue for raspberry bushes..

Coffee grounds, pee on the

By Jeremiahiii on March 31

Coffee grounds, pee on the soil (not the plant), manure from a city horse farm would be good. Sulfer if you want to buy something.

You can usually get a soil

By Almanac Staff

You can usually get a soil test kit from your local county extension office, and they will recommend any amendments that your soil may need. Wait to add the manure until you get the results from the soil test. Also make sure that your raspberries are not too crowded. You may need to prune out some of the old plants.

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