Waterscaping
Waterscaping and water gardening: the basics
Waterscaping, also called water gardening, is landscaping built around water: you choose a feature — a pond, a fountain, a waterfall or a stream — give it the depth it needs, add a pump if the water moves, and plant it with aquatic plants, each matched to the depth of water it likes above its roots.
A waterscape is a deliberately small, shallow piece of water, typically less than 20 inches (50 cm) deep, and most of its plants are sensitive to exactly how much water sits above them, so depth is a design decision rather than an afterthought. Nearly every decorative feature is a recirculating system: a pump moves the same water round through jets, spillways or a streambed instead of drawing a continuous supply. Fish are an optional extra in a waterscape, never a requirement — the plants are the point of the design. Around the water, hedges do the enclosing: a dense clipped screen gives an open waterscape its backdrop and its shelter from wind.
The types of water features
The four classic types of water feature are ponds, fountains, waterfalls and streams, and most waterscapes combine two or three of them.
A pond is the still base that the other features feed into or pour out of; a fountain can stand entirely alone; a waterfall needs a raised outlet and somewhere lower for the water to land; and a stream connects levels across a slope. Choosing between them is mostly a choice of effect — still and reflective, moving and audible, or planted and informal — and of the space and depth each one asks for, from a tabletop bowl on a patio to a full pond dug into a lawn.
Ponds: reflecting, ornamental, water garden and fish ponds
Ponds come in four types: the reflecting pond, the ornamental pool, the water garden and the fish pond.
A reflecting pond is kept still so its surface mirrors the sky and the planting around it. An ornamental pool is a formal, decorative basin, often geometric. A water garden is the plant-focused pond, stocked with the aquatic plants covered later in this guide. A fish pond is built and stocked for fish, which asks for more surface area and greater depth than a purely planted feature — the siting and depth section below gives the figures. The four types are starting points rather than boxes: most home ponds blend them, planted like a water garden and stocked lightly with fish.
Fountains: formal, disappearing, tabletop, wall, spitter and bubbler
Fountains come in six types: formal, disappearing, tabletop, wall, spitter and bubbler fountains.
A formal fountain is the tiered, symmetrical centrepiece of a courtyard or pool. The disappearing fountain works differently: its water pours over a stone or urn and vanishes into a hidden basin buried below gravel, from where the pump recirculates it — the sound and movement of water with no open standing water at all, which makes it the usual choice where standing water is a worry. Tabletop and wall fountains scale the idea down to a bowl or a wall-mounted spout, while spitter and bubbler fountains are small accents whose jets arc or well up inside a larger pond.
Waterfalls and stream gardens
A waterfall adds the two things still water cannot: sound and motion, falling over natural stones and slabs, and it gives a flat garden a vertical dimension.
A stream garden carries the idea sideways: rocks placed in the flow break it into patterns, splashing, bubbles and sound, and the shallow moving water creates microhabitats for plants, fish and wildlife. Streams and waterfalls working together above a pond are the backbone of Japanese garden landscaping, where every stone is placed to shape the water. The same stonework is a discipline of its own — edging ponds, building falls and armouring stream banks all belong to rock gardening as much as to waterscaping. The clipped shrubs that frame those falls belong to a third craft, topiary, where the shaping is the whole point.
Where to put a water garden, and how deep it should be
A water garden belongs on level ground where sun and shade stay in balance — part shade to hold algae down, but full sun reaching part of the water for the plants — and its depth depends on what the feature is for.
Water lilies flower best with long sun, around eight hours, and most water garden plants want at least six hours a day. Keep the pond away from deciduous trees and out of low spots where runoff collects, where you can: fallen leaves rot in the water and feed algae, and runoff washes garden chemicals in with them.
On depth, purpose decides. Small, plant-focused features are often shallow — under about 50 cm (20 inches) is normal — but no pond should be less than roughly 38 cm (15 inches) deep, or it overheats in summer and freezes too readily in winter; about 75 cm (30 inches) is ideal for the widest range of plants. A fish pond belongs at the deeper end, around 60–75 cm, with at least 3.5 m² of surface. For wildlife, vary the depth between about 20 and 60 cm and give the pond one long, shallow, sloping side — a beach — so creatures can climb in and out.
The depth figures at a glance:
| Purpose | Depth | Why |
|---|---|---|
| Small plant-focused feature | Often under about 50 cm (20 in) | The typical small waterscape — the plants are the point of the design |
| Any pond — the stability minimum | At least about 38 cm (15 in) | Shallower water overheats in summer and freezes too readily in winter |
| The widest range of plants | About 75 cm (30 in) | The ideal depth for the broadest choice of plants |
| Fish pond | About 60–75 cm (24–30 in), with at least 3.5 m² of surface | Fish need the deeper end of the range, plus surface area |
| Wildlife pond | Vary between about 20 and 60 cm | Varied depths, plus one long, shallow sloping side — a beach — so creatures can climb in and out |
Whatever the depth, build a planting shelf into the edge, about 20–30 cm below the surface, to hold marginal plants. A flexible butyl liner lines natural shapes most easily: leave about 15 cm of overlap at the edges and slope the sides at roughly 20°. And one decision to make early: a waterscape deliberately spends water on display, while dry-climate gardeners design water out instead — that counterpoint is xeriscaping.
What size pump does a pond or waterfall need?
A pond pump should circulate the pond’s whole volume about once an hour if fish are kept, and about once every 1½–2 hours for a plant-only or purely decorative feature.
Choose the pump by the flow it delivers at the actual height it must lift the water — the head — not by its advertised maximum, which is measured with no lift at all and flatters every model. If the feature includes a waterfall, work the flow out from the fall itself: allow roughly 125 gallons per hour for every inch of waterfall width, with a working range of 100–200 gallons per hour per inch depending on how dramatic you want the sheet of water to look.
The sizing rules at a glance:
| What you are sizing | The rule | Note |
|---|---|---|
| Fish pond | Circulate the whole volume about once an hour | The faster turnover applies where fish are kept |
| Plant-only or decorative feature | Circulate the whole volume about once every 1½–2 hours | A slower turnover is enough without fish |
| Waterfall | About 125 gallons per hour for every inch of fall width (working range 100–200) | The higher the flow per inch, the more dramatic the sheet of water |
| The pump itself | Judge it by the flow it delivers at the actual lift height — the head | The advertised maximum is measured with no lift at all and flatters every model |
Worked example: a pond 6 ft long, 4 ft wide and averaging 2 ft deep holds 6 × 4 × 2 × 7.48 ≈ 359 gallons. Stocked with fish, it needs a pump that still delivers about 360 gallons per hour at the waterfall’s height — so it is the flow figure at that lift, not the headline maximum on the box, that has to reach roughly 360 GPH.
Plants that grow in a water garden
Water garden plants fall into four groups — submerged plants, marginals, floating plants and deep-water plants — and each group belongs at a different depth in the pond.
Submerged plants, the oxygenators, grow almost completely underwater, usually placed 1–2 ft (30–60 cm) below the surface. They release oxygen as they photosynthesise and absorb nutrients that would feed algae. Hornwort is the beginner-friendly example, free-floating or loosely anchored; plant about five bunches of oxygenators per 1,000 litres of water.
Marginal plants root in shallow water at the pond edge — or in the permanently wet soil of a boggy margin beside it — with stems, leaves and flowers above the surface. Plant them in baskets set on the shelf: the basket holds each plant at its depth and keeps vigorous spreaders contained.
Deep-water plants root in baskets of soil on the pond bottom, their leaves floating on the surface — or, in the lotus’s case, rising above it. Water lilies do best with 12–18 inches (30–45 cm) of water over the crown, in still water and full sun, fed monthly through the growing season.
Floating plants stay unanchored, drifting free with their roots hanging in the water, where their shade cools the surface, cuts algae and shelters fish.
The four groups at a glance:
| Plant group | Where it sits | Water depth | Examples | What it does for the pond |
|---|---|---|---|---|
| Submerged (oxygenators) | Almost completely underwater | 1–2 ft (30–60 cm) below the surface | Hornwort | Releases oxygen; takes up nutrients algae would use |
| Marginal | Roots in shallow water at the edge, growth above the surface | Shelf 20–30 cm below the surface; barely-wet soil to several inches over the crown | Arrow head, cattail, pickerelweed, taro, water crowfoot | Greens the shallow shelf at the pond’s edge |
| Floating | Unanchored, drifting free | None — floats on the surface | Mosquito fern, water spangle, water clover, water lettuce, water hyacinth | Shades the surface, cooling the water and cutting algae; shelters fish |
| Deep-water | Rooted in soil on the pond bottom, leaves on or above the surface | 12–18 in (30–45 cm) of water over the crown | Water lilies, lotus | Floating leaves shade the surface; flowers are the centrepiece |
Before you buy floating plants: water hyacinth, water lettuce and salvinia (water spangle) spread so aggressively in natural waterways that they are banned or restricted in several US states and many other regions. Check local rules before buying them, never release any aquatic plant into streams, ponds or lakes, and dispose of surplus plants well away from waterways.
Add plants in spring to early summer, when the water has warmed and new plants root fastest.
How to start a container water garden
A container water garden is the smallest waterscape: a watertight tub of roughly 20 gallons holds one dwarf hardy water lily and a couple of marginal plants in baskets.
Set the marginals in their baskets with 0–6 inches of water over their soil, and let the lily sit deeper, towards the middle of the tub. There is no digging, no liner and no plumbing — the container is the entire feature, which is why it is the standard first waterscape for a patio, balcony or small courtyard. Upkeep runs to about ten minutes a week in summer: top up what evaporation takes and pick off yellowing leaves before they rot in a small volume of water.
A tub garden is a waterscape at miniature scale, and it rewards the same close-up design thinking as a miniature garden: one focal plant, one or two companions, and nothing the small space cannot support.
Can you keep fish in a water garden?
Fish can live in a water garden if they are stocked lightly — about one fish per 5 square feet of surface area — because in a balanced water garden the plants, not equipment, do the water cleaning.
Treat the pond as an ecosystem rather than a swimming pool: aquatic plants filter and treat fish waste, and chasing crystal-clear water with chemicals and heavy filtration works against that balance. A slight green tint from phytoplankton at times is normal and not a fault to be corrected. At light stocking, fish can forage on natural food and feeding is optional; overfeeding and overstocking are the fastest ways to degrade the water. If your tap water is chlorinated, run it through a chlorine neutraliser before any fish go in. And never release pond fish into rivers, ponds or lakes: it is illegal in many areas and harms the wild fish already living there.
Winter care for a water garden
A water garden in a cold climate gets through winter safely if its fish keep an opening in the ice, its tender plants are brought in or stored, and nobody tries to smash the ice open.
If the surface freezes over, keep a hole in the ice — a small pond de-icer will hold one open — because a sealed surface stops gas exchange and the fish below slowly use up the dissolved oxygen. Never hit the ice to break it: the shock waves travelling through the water can kill fish. Fish need little food in winter and none where ponds freeze over, the pump does not have to run all winter, and fallen leaves should be cleared out before they rot in the water.
Shallow water is the winter risk. Fish in tubs and small containers cannot winter outdoors where the water freezes solid, so bring them indoors, and lift hardy lily pots from shallow features to store in a bucket of water somewhere above freezing. Expect a short algae bloom in spring as the water warms; it clears as the plants wake up, and that is when pumps go back on.
Keeping a water garden clear and safe
A water garden stays clear when its plants do the work: cover roughly one-third to two-thirds of the surface with floating leaves and floaters, let submerged plants compete with algae for nutrients, and keep leaf litter out of the water.
Below one-third cover, algae get the light they need; aim towards the upper half of the range in a sunny fish pond, because extension guidance for fish ponds is to shade 50–75% of the surface — but always leave some open water, since a surface closed over completely restricts the gas exchange fish depend on. Skimming fallen leaves before they sink and rot is the third lever, and the cheapest.
Safety is part of the design, not an afterthought:
- A small child can drown in just a few inches of water — never leave young children unsupervised near any water garden, and site tubs and ponds where they can be fenced or covered with a rigid grate just under the surface.
- Plug pumps only into a ground-fault (GFCI/RCD) protected outdoor outlet.
- Check local rules before building: some localities apply swimming-pool barrier rules to ponds deeper than about 18–24 inches and may require a permit.
Frequently asked questions about waterscaping
Five questions come up on almost every first water garden: the two names, the depth, mosquitoes, the easiest starting feature and the floating plants to be careful with.
What is the difference between waterscaping and water gardening?
Waterscaping and water gardening are two names for the same thing — there is no practical difference between them. Both describe a garden designed around man-made water features such as ponds, fountains, waterfalls and streams, planted with plants adapted to pools and ponds. This post keeps its original name, waterscaping, while most gardeners searching the topic type “water gardening”; whichever word you use, the features, depths and plants involved are identical, and exactly the same planting and pump rules apply.
How deep should a garden pond be?
A garden pond’s depth depends on its purpose: small, plant-focused features are often under about 50 cm (20 inches) deep, any pond should be at least roughly 38 cm (15 inches) deep so the water stays stable in summer heat and winter cold, and 60–75 cm (24–30 inches) suits fish and a wider range of plants. Depth is a range to choose from, not a single rule — match it to the plants and animals the pond is actually for.
Do water gardens attract mosquitoes?
A working water garden works against mosquitoes rather than for them, because mosquito larvae must keep breaking the surface of still water to breathe. Moving water from a fountain, waterfall or bubbler stops larvae reaching the surface, and fish patrol what movement misses — a handful of minnows can eat their own weight in mosquito eggs in under a week. If a feature is still and fishless, Bti products target mosquito larvae specifically without harming other pond life, birds or mammals.
What is the easiest water feature for a small garden?
The easiest water feature for a small garden is a container water garden or a disappearing fountain. A watertight tub of roughly 20 gallons holds a dwarf water lily and a couple of marginals with no digging and no liner, while a disappearing fountain gives moving water and sound with no open standing water at all, its basin hidden under gravel. Both can be running in a weekend and neither asks for the depth or pump sizing of a full pond.
Can I plant water hyacinth and water lettuce?
Water hyacinth and water lettuce can only be planted where they are legal — both spread so aggressively outside a garden that they are banned or restricted in several US states and many other regions. Check your local rules before buying either plant. If you do grow them, keep them inside your own feature, and never release them — or any aquatic plant — into streams, ponds or lakes; surplus plants should be disposed of well away from waterways.
