Can You Plant Ornamental Grasses in the Summer?
Yes, you can plant ornamental grasses in the summer, but you need to take extra care. Summer heat and dry soil can stress new plants, so focus on consistent watering, soil preparation, and choosing the right grass types. With proper planning, your grasses will establish roots and thrive by fall.
Is summer a bad time to plant ornamental grasses?
Summer is not ideal for planting most perennials because of heat and dry conditions, but ornamental grasses are tougher than they look. Many warm-season grasses actually prefer summer planting because they love heat and grow fastest when temperatures are high. The main risk is transplant shock—if the roots dry out or if the plant comes from a sheltered nursery environment. That said, you can avoid problems by watering deeply and providing temporary shade for the first week or two.
Cool-season grasses, like fescues and blue oat grass, struggle more in summer heat. If you plant those, wait until early fall. But for the most popular ornamental grasses, summer works fine.
What ornamental grasses can survive a summer planting?
Choose warm-season grasses that are native to hot climates. These will establish quickly and handle the heat. Here are good options:
- Miscanthus (maiden grass, silver grass)
- Pampas grass
- Switchgrass (Panicum virgatum)
- Fountain grass (Pennisetum alopecuroides)
- Japanese blood grass
- Little bluestem
Here is a quick table comparing warm‑season versus cool‑season varieties for summer planting:
| Type | Heat Tolerance | Best Planting Time | Summer Success |
|---|---|---|---|
| Warm-season (miscanthus, switchgrass, fountain grass) | Excellent | Late spring to midsummer | High if watered properly |
| Cool-season (fescue, blue oat grass, feather reed grass) | Low | Early spring or early fall | Risky; avoid summer |
How do you prepare the soil for summer grass planting?
Good soil prep reduces stress on new roots. Start by loosening the soil 12–18 inches deep. Ornamental grasses have deep root systems, so compacted soil will slow them down. Mix in 2–3 inches of compost or well-rotted manure to hold moisture and add nutrients.
Check drainage—grasses hate soggy feet. If your soil is heavy clay, raise the planting bed or add sand or pine bark fines. A soil moisture meter helps you avoid overwatering, which is common in summer. Check out soil moisture meters on Amazon to keep watering on track.
Mulch the soil after planting with 2–3 inches of shredded bark, straw, or pine needles. This keeps the roots cool and slows evaporation.
How often should you water newly planted grasses in summer?
Water is the key to summer success. For the first week, water deeply every day if there is no rain. “Deeply” means enough to wet the soil 6–8 inches down. After week one, cut back to every other day for the next two weeks. Then gradually extend to twice a week until the grass is established (about 4–6 weeks).
Use a soaker hose or drip irrigation rather than overhead sprinklers. Soaker hoses deliver water right to the roots and reduce evaporation. Find soaker hoses on Amazon that connect to your outdoor faucet easily.
Check the soil before watering—stick your finger 2 inches deep. If it feels dry, it’s time to water. Avoid light sprinkling, which encourages shallow roots.
Should you fertilize ornamental grasses planted in summer?
No—skip the fertilizer at planting time. Fertilizing in midsummer can burn new roots and push weak, floppy growth. Wait until the grass is well-rooted, usually around late August or early fall. Then apply a slow-release, low-nitrogen fertilizer (like 5-10-10) or a light compost top‑dressing.
If you must feed, use a diluted liquid seaweed or compost tea. But most grasses are light feeders, so a good soil mix is enough for the first season.
How can you protect new grass plants from heat and sun?
Strong afternoon sun can stress a newly planted grass, especially if it came from a greenhouse. Provide temporary shade for the first 5–7 days. A simple cloth over a tomato cage or a piece of shade fabric propped up on stakes works. Remove it after the grass adjusts.
Another trick: plant in the late afternoon or on a cloudy day. The plant will have the cooler evening hours to recover. If you expect a heat wave, wait a few days. Shop for shade cloth on Amazon to keep a roll on hand for unexpected hot spells.
What are the biggest mistakes when planting grass in summer?
- Planting too deep. The crown of the grass should be level with the soil surface. Burying it leads to rot.
- Overwatering. Yes, you need water, but soggy soil suffocates roots. Use the finger test.
- Skipping mulch. Bare soil bakes in summer. Mulch is a must.
- Planting pot‑bound plants without teasing roots. Loosen circling roots so they spread outward.
- Not hardening off. If you bought your grass from a nursery, set it outside in a shady spot for a few days before planting.
Can you divide and transplant ornamental grasses in summer?
Dividing grasses in summer is not recommended because the heat stresses both the parent plant and the divisions. The best time is spring or early fall. However, if you absolutely must move a grass in summer, do it on a cool, overcast day. Water the plant well the day before, cut the leaves back by half, and keep the root ball moist. You may lose some plants, but with extra care it can work.
Should you trim ornamental grasses after summer planting?
Yes, but only a light trim. Cut back the foliage by about one-third to one-half right after planting. This reduces water loss through the leaves and helps the roots focus on establishing. Do not cut all the way to the ground—that removes the plant’s energy source. Leave some leaves for photosynthesis.
How long does it take for summer-planted grasses to establish?
Most warm-season grasses develop a strong root system within 4–6 weeks if watered correctly. You will see new growth at the base within two weeks. Full establishment—meaning the grass can survive on rainfall alone—takes one full growing season. In the first summer, your grass may not bloom or reach mature height. That is normal. Give it time, and by the following year it will take off.
What should you do if your grass looks stressed after planting?
If the leaves turn brown or curl, the plant is likely thirsty or getting too much sun. Check moisture first. If the soil is dry, water deeply and add more mulch. If the soil is wet, back off watering and improve drainage around the root ball. You can also mist the leaves in the early morning to cool the plant. Remove any dead or yellowing blades to keep the plant tidy.
If the grass is still struggling after a week, consider moving it to a shadier spot or replacing it with a more heat‑tolerant variety. With a little attention, most ornamental grasses will reward you with beautiful texture and movement for years.