Soil Preparation for Hydrangeas - Stark Bro's (2024)

Preparing your soil before you plant will greatly improve your plant’s performance and promote healthy, vigorous growth. It is a good idea to have your soil tested to determine if it is lacking in any essential minerals and nutrients. This can be done through your County Extension Office or with one of our digital meters.

The goal of soil preparation is to replenish vital minerals and nutrients, as well as break up and loosen any compacted soil.

NOTE: This is part 5 in a series of 10 articles. For a complete background on how to grow hydrangeas, we recommend starting from the beginning.

When To Prepare Your Soil

Soil preparation can be done at any time that the ground is not too wet or frozen. Your trees may be planted even when temperatures are quite cool. If a hard frost is expected, it is advisable to delay planting for a while until temperatures become more moderate. Generally, as long as your soil is workable, it is fine to plant.

How To Prepare Your Soil

  • Roots grow faster when they’re spread out. Dig the hole deep and wide enough so the root system has plenty of room to easily expand. Keep the topsoil in a separate pile so you can put it in the bottom of the hole, where it’ll do the most good.
  • To loosen the soil, mix dehydrated cow manure, garden compost or peat moss (up to 1/3 concentration) into your pile of topsoil. Make sure the peat moss you get is either baled sphagnum or granular peat. You can also add our Coco-Fiber Potting Medium or 2 or more inches of organic material and work in evenly with the existing soil.

Your lawn can provide you with ideal organic materials such as grass clippings and shredded leaves. Not only will the grass and leaves break down to provide soil nutrients, but they will help loosen the soil as well. You can gather these in the fall with spring planting in mind.

Common soil amendments:

  • compost
  • sand
  • manure
  • lime
  • peat moss

Adding organic materials, such as our Coco-Fiber Potting Medium and compost will improve most every soil type. Organic materials bind sandy soil particles so they retain moisture and nutrients better. They also break apart clay and silt particles, so that water can infiltrate and roots can spread.

Soil Types

  • Clay and silt soils are made of very small particles. They feel slick and sticky when wet. Clay and silt hold moisture well, but resist water infiltration, especially when they are dry. Often puddles form on clay or silt soils, and they easily become compacted.
  • Loam soil is a mix of sand, silt or clay, and organic matter. Loam soils are loose and look rich. When squeezed in your fist, moist loam will form a ball, which crumbles when poked with a finger. Loam soils normally absorb water and store moisture well. Loam soils can be sandy or clay based, and will vary in moisture absorption and retention accordingly.
  • Sandy soils contain large particles that are visible to the unaided eye, and are usually light in color. Sand feels coarse when wet or dry, and will not form a ball when squeezed in your fist. Sandy soils stay loose and allow moisture to penetrate easily, but do not retain it for long-term use.
Soil Preparation for Hydrangeas - Stark Bro's (2024)

FAQs

Soil Preparation for Hydrangeas - Stark Bro's? ›

To loosen the soil, mix dehydrated cow manure, garden compost or peat moss (up to 1/3 concentration) into your pile of topsoil. Make sure the peat moss you get is either baled sphagnum or granular peat.

What is the best soil to plant hydrangeas in? ›

For bigleaf hydrangeas, the best is loam soil. Loam soil is made up of a pretty even mixture of sand, silt, and clay, giving it a great well-balanced texture. Loam soil has good water retention and has excellent drainage, which provides a healthy environment for hydrangeas to thrive.

Should I soak hydrangeas before planting? ›

Before planting: soak roots in a tub or large trash can of water for one to two hours to keep them from drying while you dig. Do not soak more than six hours. DO NOT expose roots to freezing temperatures while planting.

Can you use regular potting soil for hydrangeas? ›

Start With Good Soil

We used Miracle Grow Moisture Control Potting Soil because hydrangeas like to be well-hydrated. But any good quality potting soil will do.

What is the best soil additive for hydrangeas? ›

Common soil amendments:
  • compost.
  • sand.
  • manure.
  • lime.
  • peat moss.

What is the best fertilizer for hydrangeas? ›

Hydrangeas thrive when fed a balanced or all-purpose fertilizer like 10-10-10 NPK or 12-4-8 NPK. Fertilizers formulated for roses are another good choice.

Is Miracle-Gro good for hydrangeas? ›

Miracle-Gro® Water Soluble Bloom Booster® Flower Food will make your hydrangeas blossom into the most captivating colors.

How do you prepare the hole for planting hydrangeas? ›

Create a hole twice as wide as the plant's root system, and about six inches deeper than the plant's pot. Break up the soil a bit before you plant to help the roots easily establish themselves. Score, or rough up, the sides of the hole before planting your hydrangea.

Should I water hydrangeas every day? ›

Deep weekly watering is usually enough (if you don't get enough rain). Although you may need to water more often in hot, dry weather. Water hydrangeas deeply and regularly in the first growing season to encourage an extensive root system.

Do hydrangeas do better in pots or in the ground? ›

Hydrangeas grow well in gardens, but can also grow in pots. They need well draining soil that has a slightly acidic pH. If these are not the conditions in your garden, I urge you to try planting a hydrangea in a container.

What side of the house do you plant hydrangeas on? ›

This is because hydrangeas love the warm morning sun, but they dislike the heat of the afternoon. The best place to plant hydrangeas is in a sheltered location with sunny mornings and shady afternoons. You often find this on the north or south side of your home.

How do you make soil basic for hydrangeas? ›

The most common way to raise the pH of your soil (make it more alkaline and less acidic) is to add powdered Garden Lime. Dolomitic limestone will also add magnesium to the soil. Apply it in the fall as it takes several months for the effects to be noticeable. Wood ash will also raise soil pH.

What month is best to plant hydrangeas? ›

So, when is the best time to plant hydrangeas? Aim for late spring, well after any danger of frost has passed, or early fall, when night temperatures usher in cooler air. If you garden in a region where the ground freezes, get plants into the ground at least six weeks prior to fall's first killing frost.

Do hydrangeas like coffee grounds in the soil? ›

If you're growing hydrangeas, use coffee grounds to affect their color. Coffee grounds add extra acidity to the soil around hydrangeas. On a chemical level, this increased acidity makes it easier for the plant to absorb naturally occurring aluminum in the dirt. The effect is pretty blue clusters of flowers.

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