5 things to weigh up on front yard plant combinations

What to take away

1. Water use, grouped into hydrozones

A hydrozone is an area watered on one schedule. Group plants by how much water they need, and the irrigation design follows from that, not the other way around.

Dry zones suit blue grama (Bouteloua gracilis), yarrow and agastache. Thirstier zones suit swamp milkweed (Asclepias incarnata), sedges (Carex) and switchgrass. A Netafim or Rain Bird drip line on its own valve lets each zone run on a separate clock.

Mixing a thirstier riparian plant into a dry bed means the whole zone runs wet to keep one plant alive. The dry-adapted plants around it sulk or rot.

On a slope, run the dry zone at the top and the thirstier zone at the bottom, where water collects anyway.

Named combinations for one dry hydrozone: blue grama + yarrow + agastache across the front. Little bluestem + Sedum 'Angelina' + Echinacea purpurea through the middle. Panicum virgatum 'Shenandoah' + oakleaf hydrangea + goldenrod against the wall. For a wetter zone, swap in swamp milkweed + Carex + switchgrass.

The USDA Economic Research Service, writing on irrigation and water conservation in the West, describes cost-share programs built to move operators onto more efficient irrigation. Residential turf conversion runs on the same logic: change the schedule by changing the planting.

2. Soil texture and drainage

Clay holds water and starves roots of oxygen. Sand drains before roots can drink. Most native species are sold as adaptable, and most still have a preference.

A percolation test tells you how fast water leaves the hole. Dig a hole about 12 inches deep, fill it, and time how far the level drops each hour. Slow drainage usually means under 1 inch per hour.

Then amend, plant a wet-tolerant selection such as inkberry (Ilex glabra) or summersweet (Clethra alnifolia), or build a raised bed.

A soil test through your state's land-grant extension office typically runs $10 to $40, depending on the panel.

Do not amend a whole native bed by habit. Regional natives on unamended local soil often establish better, and amendment is a cost you carry every season. Test first, then decide.

3. Height and structure

Plant by mature height, not by the size of the pot on the shelf. A one-gallon shrub and a one-gallon grass can end up four feet apart in height.

The standard three-layer front yard:

Keep the tallest plants away from windows you want light through. A bed that reads as a flat carpet in year one reads as a hedge blocking the porch by year four.

4. Bloom timing and pollinator value

A bed that blooms for three weeks in spring feeds pollinators for three weeks. Stagger flowering across the season and the same square footage works far longer.

Aim for at least one plant group in flower in each of spring, summer and fall. Penstemon and columbine open the spring. Echinacea purpurea and Rudbeckia hirta carry summer. Asters, goldenrod and California fuchsia (Epilobium canum) close the fall.

Early bloomers feed overwintered bees. Late bloomers feed migrating butterflies and hold seed heads for birds through winter.

Keep seed heads standing until late winter unless the species needs cutting back earlier. That is free habitat and free structure.

5. Rules, covenants and plant lists

Western water utilities commonly pay $1 to $3 per square foot for turf conversion. As of the most recent published terms, the Southern Nevada Water Authority has paid around $3 per square foot in Las Vegas, and the Metropolitan Water District of Southern California around $2 per square foot.

Most programs require a pre-inspection of the existing turf, set a minimum plant density, and cap the irrigated area. Rules differ sharply between districts, so read the current terms from the program administrator.

For HOA covenants, deed restrictions, or protected-tree removal, ask your HOA board, your municipal code office, or a local attorney. Requirements vary by state and municipality, and no article can substitute for the authority that sets them.

A worked example

Take a 400 square foot front bed on clay. Two contractors quote turf removal at a per-square-foot rate; multiply each by 400 to compare. Count plants from the plan at your intended spacing, not the spacing that looks full on day one.

At 18 inch centers, 400 square feet holds about 175 plants. Move a third of the bed to shrubs and taller grasses at 3 foot centers and the count falls to about 135.

Typical unit prices at native nurseries: plugs at $2 to $5 each, one-gallon perennials and grasses at $9 to $15 each, two-gallon shrubs at $25 to $45 each.

Eighty plugs, 45 one-gallon plants and 15 shrubs come to $940 to $1,750 in plants.

Price mulch by volume, and split a bulk delivery with a neighbor. At 2 to 3 inches deep, 400 square feet takes 2.5 to 4 cubic yards, or $65 to $200 at $25 to $50 per cubic yard delivered.

Add a contingency of about 15 percent, plus two seasons of your own watering and weeding. At this scale the contingency is $140 to $260.

Materials land near $1,150 to $2,200, or about $3 to $6 per square foot. Hired layout and planting at $1 to $3 per square foot takes the same bed to $4 to $9 per square foot.

Buying smaller stock, phasing half the yard this year, or paying for a concept plan and planting it yourself all cut the number without cutting the result.

For small areas, plugs, seed and shared plant sources cut the plant line further than anything else. Pin the substitution rule down while you are still interviewing, using the questions a crew should answer without hedging.

Container size drives plant price more than species does, and the US Botanic Garden's production facility guidance covers how nursery stock is grown and sized: usbg.gov guidance.

Common questions

Do I need a designer for one bed?

No. A concept plan is worth paying for on a whole front yard, where the layers and the irrigation zones have to fit together.

For one bed, most homeowners can set the hydrozones and the height layers themselves.

If you would rather compare the two ways to run front yard plant combinations ideas, buy the mid-layer shrubs and the drip valves first and fill the gaps with plugs later.

Are plugs a false economy?

No, for grasses and many perennials that establish fast. Yes, where you need immediate structure or a screen. Match the stock size to how visible the plant is and how fast it fills in.

For US homeowners the sticking point is plugs against larger stock, so order plugs for spreading perennials and grasses and one-gallon stock for the first eight feet.

How long until the bed looks finished?

Two growing seasons is realistic for most native perennials and grasses. Budget the watering and weeding for both, or plan to buy replacements.

Where do I check rebate rules?

Your water district or the current program administrator. Amounts, density minimums and pre-inspection requirements change, so confirm eligibility before you remove any turf.