How to Divide Ornamental Grasses: A Simple Guide

How to Divide Ornamental Grasses?

To divide ornamental grasses, start by using tools like a sharp knife, chain saw, fork, or spade.

The best time to divide and move these grasses is in May.

Dividing grasses has several benefits, including obtaining more plants without buying new ones and preventing rust.

To divide, lift the clump and separate it into substantial sections.

When replanting, make sure to place the divided grasses at the same level as before and water them well.

Monty recommends thinning crowded clumps and repositioning them with more space.

Lastly, exercise caution with certain grasses that have sharp leaves and wear gardening gloves for protection.

Key Points:

  • Tools such as a sharp knife, chain saw, fork, or spade can be used to divide ornamental grasses.
  • The best time to divide and move these grasses is in May.
  • Dividing grasses has benefits such as obtaining more plants and preventing rust.
  • To divide, lift the clump and separate it into substantial sections.
  • When replanting, make sure to place the divided grasses at the same level as before and water them well.
  • Monty recommends thinning crowded clumps and repositioning them with more space.


Did You Know?

1. Ornamental grasses are not actually classified as true grasses, but rather as perennial plants from the Poaceae family. Despite this, they are still commonly referred to as grasses due to their similar appearance and growth habits.

2. “Dividing” ornamental grasses is not the same as splitting them into separate plants. Instead, it involves separating the plant into smaller clusters or clumps, ultimately promoting healthier growth and preventing overcrowding.

3. The ideal time to divide ornamental grasses is usually in early spring or late fall, as this allows the plants to establish themselves before the extreme heat or frost sets in. However, certain grasses may have specific preferences, so it’s always recommended to research the specific type you have.

4. While most ornamental grasses benefit from division every two to three years, there are some exceptions. For instance, Chinese fountain grass (Pennisetum alopecuroides) tends to form tight clumps and only requires division every four to five years.

5. Division is not the only method of propagation for ornamental grasses. Some varieties can also be grown from seed, though this method often takes longer and may result in less uniform growth compared to division. Additionally, not all ornamental grasses produce viable seeds, so propagation by division remains the most reliable option for many gardeners.

Tools For Dividing Grasses

When dividing ornamental grasses, using the right tools is crucial for a successful process. You will need the following tools:

  • Sharp knife or saw: This tool is essential for cleanly cutting through the clumps. It is particularly useful for dividing smaller grasses or those with soft stems.
  • Fork or spade: These tools will help you loosen the clump from the ground, making it easier to lift and divide.
  • Gardening gloves: It is important to wear gloves to protect your hands from the sharp leaves of the grasses.
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For larger and tougher grasses, a chainsaw may be necessary to effectively divide them. Using these tools appropriately will ensure a smooth and efficient process of dividing ornamental grasses.

Best Time To Divide And Move Ornamental Grasses

The best time to divide and move ornamental grasses is in the spring, typically in May. This timing allows the plants to establish themselves before the hot summer months arrive. Dividing in spring also allows you to enjoy the grasses’ foliage and flowers during the summer. If you divide grasses in the fall, they may not have enough time to establish their root systems before winter, which can lead to their failure to survive.

  • Dividing and moving ornamental grasses in the spring, specifically May, is highly recommended.
  • Spring division allows for proper establishment of the grasses before the arrival of hot summer weather.
  • Enjoy the beauty of their foliage and flowers during the summer months.
  • Avoid dividing in the fall, as this timing may not provide enough time for the grasses to develop strong root systems before winter, risking their survival.

“The best time to divide and move ornamental grasses is in the spring, typically in May.”

Benefits Of Dividing Grasses

Dividing grasses offers several benefits for gardeners and the plants themselves. One of the main advantages is that it allows you to obtain more plants without purchasing new ones. By dividing the clumps, you can create multiple new plants, which is both cost-effective and provides an opportunity to expand your garden beds or share the extras with other gardeners.

Another benefit of dividing grasses is the prevention of diseases such as rust. Overcrowded grasses restrict airflow, creating a favorable environment for diseases to spread. Dividing the clumps not only provides more space for each plant but also improves air circulation, reducing the risk of ailments.

  • Cost-effective way to obtain more plants
  • Expands garden beds or allows for sharing with fellow gardeners
  • Prevents diseases like rust by improving air circulation

“Dividing grasses provides numerous benefits for gardeners and plants alike.”

Technique For Dividing Grasses

To divide ornamental grasses, begin by using a fork or spade to gently lift the clump out of the ground. It is crucial to keep the root system intact while doing so. Once lifted, use a sharp knife or saw to divide the clump into substantial sections. Make sure each division has an adequate amount of foliage and healthy roots. The method of separation will depend on the grass’s size and density. You can either carefully cut through the center or use the saw to make multiple slices.

  • Use a fork or spade to lift the clump out of the ground
  • Keep the root system intact
  • Divide the clump into substantial sections
  • Ensure each division has enough foliage and healthy roots

“It’s important to keep as much of the root system intact as possible.”

(Note: The blockquote is used to emphasize the importance of keeping the root system intact)

Replanting Divided Grasses

After dividing the grasses, it’s crucial to replant them correctly. Here are the steps to follow:

  1. Dig a hole for each divided section in a new location or in a larger container if you plan to keep them potted.
  2. Ensure that the hole is deep and wide enough to accommodate the roots comfortably.
  3. Position the divided segment at the original level it was planted in, making sure not to bury it too deep or leave it exposed.
  4. Firmly press down the soil around the roots to eliminate any air pockets.
  5. Finally, water the newly planted grasses thoroughly to settle the soil and provide much-needed moisture.

  6. Dig a hole for each divided section

  7. Ensure hole is deep and wide enough
  8. Position divided segment at original level
  9. Firmly press down the soil around the roots
  10. Water the newly planted grasses thoroughly

“After dividing the grasses, it’s crucial to replant them correctly.”

Recommendations From Monty On Dividing Ornamental Grasses

Renowned gardener Monty Don provides valuable recommendations for dividing ornamental grasses.He suggests thinning out crowded clumps of grasses that tend to seed freely and spread quickly. By removing excess growth, you can give the remaining plants more space to grow and prevent them from taking over your garden.

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Monty also advises caution when dealing with certain grasses that have sharp leaves. It’s essential to wear gardening gloves to protect your hands from potential injuries while handling these grasses. By taking the necessary precautions, you can enjoy dividing your ornamental grasses without any mishaps.

Dividing ornamental grasses in the spring is a straightforward process that requires the right tools and techniques.Using a sharp knife or saw, fork or spade, and wearing gardening gloves, you can safely and successfully divide your grasses. This process allows you to obtain more plants, prevents diseases, and ensures healthier growth. Remember to replant the divided grasses at the correct level and water them well. Following Monty Don’s recommendations regarding thinning crowded clumps and handling sharp-leaved grasses will further enhance your dividing experience.

Frequently Asked Questions

1. What are some important factors to consider when dividing ornamental grasses?

When dividing ornamental grasses, there are a few important factors to consider. Firstly, timing is crucial. The best time to divide ornamental grasses is during their dormant period, which is usually in early spring or late fall. This allows them to establish new roots before they start their active growth phase.

Secondly, proper tools and techniques are necessary to ensure successful division. It is important to use sharp, clean tools to minimize damage to the plant. Dividing the grasses into sections with healthy roots and shoots is essential. Additionally, it is crucial to not divide the grass too much, as this can weaken the plant.

Overall, considering timing and using proper techniques are key factors in successfully dividing ornamental grasses.

2. Can you divide ornamental grasses at any time of the year, or are there specific seasons to do so?

Ornamental grasses are best divided in the spring or fall, as these seasons provide optimal conditions for their successful establishment. Dividing them during these times allows the plants to recover from the shock of being divided before extreme temperatures occur. In spring, dividing ornamental grasses provides ample time for the roots to establish before the heat of summer, while dividing in fall allows the grasses to establish before winter arrives. It is generally recommended to avoid dividing ornamental grasses during the hot summer months or the freezing winter months, as these extreme conditions can stress the plants and hamper their ability to recover.

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3. Are there any specific tools or techniques that are recommended for dividing ornamental grasses?

Yes, there are specific tools and techniques that are recommended for dividing ornamental grasses. One tool that is commonly used is a sharp, serrated knife or a saw. This is used to carefully cut through the clump of grass, ensuring that each division has a good portion of roots and foliage. Additionally, using a garden fork or spade can help to pry the clump apart if it is particularly large or dense.

As for techniques, it is generally recommended to divide ornamental grasses in either spring or early fall, when they are not actively growing but the soil is still warm. Start by cutting the foliage back to about one-third of its height to make handling and division easier. Then, carefully lift the clump out of the ground and use the recommended tool to divide it into smaller sections. Each division should have a healthy amount of roots and shoots. Finally, replant the divisions in a prepared area with well-draining soil and plenty of sunlight, ensuring proper spacing between each plant. Water thoroughly and continue to care for the newly divided grasses as needed.

4. How do you know when a clump of ornamental grass is ready to be divided, and what signs should you look for?

When a clump of ornamental grass is ready to be divided, there are a few signs to look for. First, you should observe if the clump has become too large for its current location or container. If the center of the clump is dead or dying and the outer edges are growing vigorously, it is an indication that the grass is ready for division. Another sign is if the grass starts to exhibit overcrowding, with the growth becoming sparse and the center losing its vigor. Additionally, if the grass starts to show signs of declining health, such as decreased flowering or browning of leaves, it may be a sign that it needs division to rejuvenate.

To divide an ornamental grass, you should start by digging up the entire clump using a shovel or garden fork. Then, you need to separate the clump into smaller sections using a sharp knife or by pulling the clump apart with your hands. Each individual section should have healthy roots and a sufficient amount of foliage. After division, the new divisions can be replanted in their desired locations or containers, ensuring they are adequately watered and cared for to establish new growth.

References: 1, 2, 3, 4

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