Water established perennials about once a week, giving roughly 1 inch of water including rain. New perennials need water every day for the first week, then every 2 to 3 days for about a month. After their first year, many perennials only need extra water in dry spells.
A starting point, not a rule. Check the soil before each watering and stretch the gap in cool, cloudy weather.
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Perennials are the plants that pay you back. Look after them well in the first year, and they come back stronger every spring with less and less help.
The secret is the root system. A perennial spends its first season pushing roots deep into the bed. Once those roots are down, it can find water on its own for most of the summer. Your job is to water often while it is new, then deeply and only when needed.
Perennial watering schedule
| Time since planting | How often |
|---|---|
| Week 1 | Every day |
| Weeks 2 to 6 | Every 2 to 3 days |
| Rest of the first season | 1 to 2 times a week |
| Established, normal summer | Once a week, about 1 inch |
| Established, dry spell | Every 4 to 5 days |
Some perennials, such as hostas and astilbe, like more water. Others, like lavender, sedum and coneflowers, like less once settled.
How to tell when perennials need water
Push a finger 2 to 3 inches into the soil near the plant. Dry at that depth means water. For new plants, test right at the edge of the root ball, which dries faster than the soil around it.
Watch for leaves that droop in the morning, not just in the afternoon heat. Afternoon wilting that fades by evening is normal for many plants.
How to water perennials
- Water in the morning. Leaves dry fast, which helps prevent powdery mildew on plants like phlox and bee balm.
- Water at the base. A soaker hose snaking through the bed works well.
- Soak deeply. Water until the top 6 to 8 inches of soil are moist.
- Mulch the bed. A 2 inch layer of shredded bark or leaves keeps soil cool and moist between waterings.
Signs of overwatering and underwatering
Too much water
- Yellow lower leaves
- Crowns that rot and do not return in spring
- Gray mold or mildew on leaves
- Floppy, weak stems
Too little water
- Morning wilting
- Brown, crispy leaf edges
- Fewer or smaller flowers
- Plants going dormant early in summer
Getting new perennials through the first year
Spring and fall are the best times to plant, because cooler weather means less water stress. Summer planting works too, but it means daily water for longer.
Water each new plant in its pot an hour before planting. Then water well again once it is in the ground. Keep the bed evenly moist for the first month, and do not let the root ball dry out.
For plant-specific advice, see our guides to hostas and lavender, two perennials at opposite ends of the water scale.
Perennials watering FAQ
Should I water perennials every day?
Only in the first week after planting. Established perennials do best with deep watering about once a week.
How long do new perennials need extra water?
About one full growing season. By the second year, most can handle short dry spells with little help.
Do perennials need water in fall?
Yes, if the weather is dry. Keep watering until the ground cools, so roots go into winter healthy.
We turn horticulture research and real growing experience into plain-English watering schedules you can actually follow.