What To Plant Around Water Features In Illinois

Designing the planting around a pond, fountain, or rain garden in Illinois requires attention to local climate, hydrology, wildlife, and maintenance. Illinois spans USDA zones roughly 4 through 7, which means cold-hardy plants are essential in the north and a broader palette is available in the south. This article gives practical, site-specific guidance: which plants to choose by planting zone and function, how to install them safely around liners and pumps, and how to manage maintenance and invasives so your water feature becomes attractive, resilient, and wildlife-friendly.

Understand the planting zones around a water feature

Successful planting starts with mapping micro-zones created by the water feature. Create a simple cross-section of the edge and label depth and moisture bands. Typical zones are:

• a deep zone (water deeper than 12 inches) for submerged and deep marginal plants
• a shallow/marginal shelf (0 to 12 inches) for emergent plants and bog species
• a moist transition/shoreline (saturated to occasionally wet) for shrubs, sedges, and moisture-loving perennials
• an upland dry zone (normal garden soil conditions) for trees and shrubs that prefer well-drained soils

Knowing these bands tells you which species will thrive where, and helps avoid planting aggressive species where they will spread into open water or damage liners and pumps.

Native and non-native considerations for Illinois

Choose native plants where possible. Native species evolved with local insects and birds and frequently require less input while providing superior wildlife value. Non-native ornamental species can be used where they are non-invasive and offer important seasonal interest, but avoid any plant listed as invasive for Illinois.
Common invasive species to avoid around water features in Illinois:

• Purple loosestrife (Lythrum salicaria)
• Yellow flag iris (Iris pseudacorus) in many areas
• Phragmites (common reed)
• Reed canary grass (Phalaris arundinacea)
• Water lettuce and water hyacinth (floating invasives)

Planning to exclude or remove these species at the first sign will save years of trouble.

Recommended plants by function and depth

Below are practical plant choices grouped by how they are used at the pond edge. I list native options first, then non-invasive ornamental alternatives where appropriate. Plant choices are broadly hardy across Illinois; check local nurseries for cultivars and exact zone hardiness.

• Deep water / submerged (best for oxygenation and fish habitat)
• Elodea canadensis (waterweed) — a modest native oxygenator (monitor for crowded growth).
• Vallisneria americana (eelgrass) — good submerged beds for clarity and cover.
• Chara spp. — beneficial macroalgae-like plants that support clarity (not purchased often but beneficial if present).
• Shallow emergent / marginal (shelves 2 to 12 inches)
• Pontederia cordata (pickerelweed) — native, summer-blue spikes, good pollinator plant.
• Iris versicolor (blue flag iris) — native, excellent for spring color on the shoreline.
• Lobelia cardinalis (cardinal flower) — vivid red spikes, best in groups, attracts hummingbirds.
• Caltha palustris (marsh marigold) — early spring bloom, great for bright color.
• Sagittaria latifolia (arrowhead) — attractive foliage and white flowers; bulbs also feed wildlife.
• Juncus effusus (soft rush) and Carex spp. (sedges) — excellent for stabilizing soil and creating texture.
• Floating and surface plants
• Hardy water lilies (Nymphaea spp.) — provide shade to reduce algae and offer summer flowers; choose hardy species for Illinois zones 4-7.
• Nuphar variegata (yellow pond lily) — native alternative with large pads and yellow flowers.
• Avoid free-floating invasives (water hyacinth, water lettuce) unless in a controlled greenhouse setting.
• Moist-border perennials and grasses (transition and upland edge)
• Eutrochium purpureum (Joe Pye weed) — tall, late-season flowers that attract pollinators.
• Panicum virgatum (switchgrass) — native ornamental grass for structure and winter interest.
• Calamagrostis x acutiflora ‘Karl Foerster’ (feather reed grass) — reliable vertical accent and good in moist soil.
• Chelone glabra (turtlehead) — shade-tolerant and moisture-loving; late-summer blooms.
• Asclepias incarnata (swamp milkweed) — supports monarchs and tolerates wet ground.
• Shrubs and trees for wet sites (plant at a distance depending on root aggressiveness)
• Cephalanthus occidentalis (buttonbush) — native, blooms summer, tolerates saturated soils.
• Cornus sericea (red-osier dogwood) — good for shoreline stabilization and winter twig color.
• Betula nigra (river birch) — small to medium tree tolerant of wet soils.
• Quercus macrocarpa (bur oak) and Quercus bicolor (swamp white oak) — larger-scale plantings for habitat but keep root distance from liners.

Practical planting techniques

• Create a planting shelf before installing plants. Most marginal plants need a firm shallow shelf 2 to 10 inches below water level. Use pond liner and rocks to form the shelf, and backfill with aquatic planting media or heavy clay garden soil.
• Use baskets or aquatic pots. Planting directly into liner substrates can lead to root intrusion and clog pumps. Place plants in rigid baskets or pots wrapped with hardware cloth, anchored with gravel to keep them stable.
• Depth rules of thumb:
• Bog plants: roots wet but crowns above water, 0 inches depth.
• Marginal emergents: crowns just at or slightly submerged, 0-6 inches water over crown.
• Deeper marginals and lilies: 6-18+ inches depending on species; check plant label.
• Use aquatic soil or a heavy loam-clay mix. Avoid light potting mixes that will wash out and increase turbidity. Top with a one-inch layer of gravel to keep soil from floating.
• Fertilize cautiously with aquatic fertilizer tablets for heavy feeders like water lilies and pickerelweed. Avoid overfertilizing; excess nutrients fuel algae.

Design principles for aesthetics and function

• Mass plantings. Grouping plants in odd-numbered drifts (5, 7, 9) looks natural and provides stronger habitat value.
• Layer vertically. Use tall plants for background, mid-height marginal plants on the shelf, and low sedges at the waterline to create depth.
• Provide seasonal interest. Mix early bulbs and marsh marigold for spring, irises and lilies for summer, and grasses and seed heads for fall/winter structure.
• Consider wildlife. A variety of plants will draw insects, birds, amphibians, and beneficial dragonflies. Provide shallow edges for frogs and turtles and areas of dense emergent growth for insect life.

Maintenance and management

• Monitor and divide. Many aquatic perennials spread aggressively. Divide and remove excess clumps every 2-4 years to keep plants healthy and prevent monocultures.
• Control algae naturally. Increase floating or marginal shade with lilies and marginal plants, maintain good circulation and aeration, avoid excess nutrients from lawn runoff and too many fish.
• Watch for invasives. Remove seedlings of purple loosestrife, Phragmites, or reed canary grass immediately. Do not compost invasive aquatic plants.
• Winter care. Hardy natives typically die back and re-emerge. Cut back spindly stalks in late winter or early spring when new growth is visible. Protect tender non-hardy specimens by lifting pots or moving to sheltered areas.

Safety and practical cautions

• Maintain distance between large trees and the liner. Roots from willows and poplars are highly aggressive; plant trees a safe distance away or install root barriers.
• Keep mechanical equipment clear. Position pumps and skimmers where roots and shrubs will not interfere, and provide service access.
• Consider children and pets. Avoid steep drop-offs and slippery rock edges. Use gentle slopes or stepping stones that are secure.
• Mosquito control. Aeration, fish that eat larvae, and surface predators like dragonfly nymphs reduce mosquitoes. Avoid stagnant water and dense mats of floating plants that prevent surface circulation.

Example planting plans for common Illinois situations

• Small backyard pond (3-6 feet across, 12-24 inch depth), zone 5-6:
• Deep: 1 hardy water lily in an aquatic pot at 12-18 inches.
• Marginal shelf: clusters of pickerelweed (Pontederia cordata), blue flag iris (Iris versicolor), and soft rush (Juncus effusus).
• Upland edge: switchgrass and a small clump of swamp milkweed for pollinators.
• Rain garden or stormwater basin (temporary ponding up to 12 inches), zone 4-6:
• Core: sedge mix (Carex spp.), marsh marigold for spring color.
• Middle: turtlehead (Chelone glabra), Joe Pye weed for summer structure.
• Perimeter: red-osier dogwood and switchgrass for winter structure and erosion control.
• Large naturalized pond (wildlife focus), zone 4-7:
• Deep beds of Vallisneria and native submerged plants for fish habitat.
• Extensive marginal bands of arrowhead, pickerelweed, blue flag iris, and rushes for shoreline stability and amphibian cover.
• Scattered buttonbush and swamp white oak planted outside the immediate liner zone for nesting and large-animal habitat.

Final takeaways

Planting around water features in Illinois should prioritize site-specific zones, native species, and careful installation practices to protect liner integrity and equipment. Use emergent and marginal plants to stabilize banks, provide wildlife habitat, and reduce algae. Avoid invasive species, plant in baskets or heavy soil, and design with layers and masses to create both beauty and function. With appropriate choices and routine maintenance, your water feature will be an attractive, sustainable element of an Illinois landscape for decades.