WateringTimesWatering plan, $19
Viola odorata, WUCOLS IV

How often to water sweet violet in California

In July in the Central Valley, established sweet violet in loam needs a deep watering about every 8 days: about 2.2 gallons each time for a plant 2 feet across, about 1.9 gallons a week. Sweet violet is a low, shade-loving groundcover that spreads by runners into a carpet of heart-shaped leaves. Fragrant purple or white flowers open in late winter and spring above the foliage. It prefers soil that stays evenly moist and struggles in hot, dry, sun-baked spots, especially in warmer parts of the state.

Ground coverPerennialRated for 4 of 6 zones

How often to water sweet violet, month by month

Your city
Plant width
2 ft
Your soil

Type your city above and the days between waterings and the gallons appear here, worked out from your city's climate table. Or read the figures by climate zone further down.

Every month, on your water days. The personal plan prints this for sweet violet and the rest of your yard, on the days your water supplier allows.Get the plan for $19

How this is worked out: established roots fill the top 1.5 feet of soil, and you water again when that soil has dried halfway. Loam soil holds about 1.5 inches of water per foot. Water the whole area the plant covers, and skip a watering after a good soaking rain.

Which soil do you have?

Dig down a few inches, take a handful of moist soil and squeeze it.

  • Sandy: gritty, falls apart when you open your hand, will not form a ball.
  • Loam: forms a soft ball that crumbles when you poke it.
  • Clay: forms a firm, sticky ball and squeezes out into a ribbon between thumb and finger.

Still not sure? Pick loam. Most garden beds sit between sand and clay.

How to measure plant width

A shrub with its width marked from one side to the other and the circle under it shaded blue

Measure across the plant, from the tips of the leaves on one side to the tips on the other.

Water the whole area the plant covers, shown in blue. The gallons here cover that area.

A wider plant means more gallons each watering, not more waterings. While it is young, measure again each spring.

How to tell it needs water

  • Soil dry an inch or two down beneath a spreading violet patch signals it needs water
  • Limp or papery violet leaves call for checking moisture and sun exposure before watering
  • Sparse late-winter flowers alone do not establish that the violet bed is too dry
  • Persistently soggy soil around violet crowns suggests overwatering or inadequate drainage
  • Leaf spots need inspection as a possible disease problem, even when soil moisture seems suitable

How to water it

  • Water a sweet violet bed at the soil surface rather than wetting the leaves overhead
  • Soak the root zone a couple of inches deep, then let the surface dry slightly before watering again
  • Spread a thin layer of mulch to hold moisture without burying the crowns
  • Check drainage across the violet bed before planting, including any areas with heavy soil
  • Extend watering to the edges of the patch as runners root into new ground

Through the seasons

During its first year, sweet violet needs even moisture while runners and roots establish across the bed. Established plants form an evergreen mat, with scented flowers appearing in late winter and spring. Check moisture during flowering and through warm weather, without keeping the crowns saturated. Coastal and valley rain typically covers much of the cool season where this plant grows well. WUCOLS rates sweet violet moderate water on the north-central coast, in the Central Valley and on the south coast. It rates high water in South Inland. WUCOLS has not evaluated it for the high desert or the low desert.

In pots

Sweet violet grows well in a shaded container packed with spreading runners. Check the top inch of mix often during California summer heat, since even a shaded pot can dry out between waterings. Water until it drains through the holes, then empty the saucer so the crowns do not sit wet. Move a container into cooler, filtered light if afternoon sun scorches the leaves. If the runners outgrow their pot, divide the clump; check moisture during winter rather than assuming the evergreen plant is dormant.

1 Your climate zone six WUCOLS zones, each from its own reference city
2.67gal per sq ft in JulyModerate water use in the Central Valley zone
A year
17.11 gal per sq ft
Reference
Sacramento climate table
Counts
Plant need, before sprinkler losses
1.02.03.04.00.4JAN0.65FEB1.09MAR1.52APR2.08MAY2.48JUN2.67JUL2.39AUG1.8SEP1.18OCT0.56NOV0.34DEC1.02.03.04.00.4JFM1.52AMJ2.67JAS1.18OND
Gallons per square foot per month, Central Valley. Peak 2.67 in Jul, 17.11 a year.

Monthly water need by climate zone

Sweet Violet: gallons per square foot per month, by WUCOLS climate zone

MonthN. CoastC. ValleyS. CoastS. InlandHi DesertLo Desert
Jan0.370.40.781.24––
Feb0.530.650.811.39––
Mar0.871.091.152.08––
Apr1.181.521.42.58––
May1.462.081.613.12––
Jun1.612.481.743.67––
Jul1.612.671.984.02––
Aug1.492.391.863.72––
Sep1.241.81.492.98––
Oct0.871.181.152.13––
Nov0.470.560.841.44––
Dec0.310.340.651.09––
Year1217.1115.529.46––

How this is worked out: the WUCOLS water rating for each zone times that zone’s climate for the month. A dash means WUCOLS does not rate the plant there. The figures are what the plant uses, before sprinkler losses.

Plants with the same water needs 16

Rated moderate water in the Central Valley, like sweet violet. Plants that drink alike can share one valve and one schedule.

DahliasDahlia spp.moderate water, Central Valley2.67 gal/sq ft in JulyStar JasmineTrachelospermum jasminoides and cvs.moderate water, Central Valley2.67 gal/sq ft in JulyHoneysuckleLonicera japonicamoderate water, Central Valley2.67 gal/sq ft in JulyFernsNephrolepis cordifolia (SHADE IN DESERT)moderate water, Central Valley2.67 gal/sq ft in JulyDayliliesHemerocallis spp. & cvs.moderate water, Central Valley2.67 gal/sq ft in JulyBegoniasBegonia & ssp. & cvs. (shade in the desert)moderate water, Central Valley2.67 gal/sq ft in JulyIvyHedera helixmoderate water, Central Valley2.67 gal/sq ft in JulyCalla LiliesZantedeschia aethiopica SHADE IN DESERTmoderate water, Central Valley2.67 gal/sq ft in JulyStrawberriesFragaria spp. & cvs. (CA native and non-natives species)moderate water, Central Valley2.67 gal/sq ft in JulySageSalvia officinalis and cvs.moderate water, Central Valley2.67 gal/sq ft in JulyBicolor MonkshoodAconitum cammarummoderate water, Central Valley2.67 gal/sq ft in JulyGarden MonkshoodAconitum napellusmoderate water, Central Valley2.67 gal/sq ft in JulyCarpet BugleAjuga reptans (shade)moderate water, Central Valley2.67 gal/sq ft in JulySnowdrop WindflowerAnemone sylvestrismoderate water, Central Valley2.67 gal/sq ft in JulyGreen Supreme ManzanitaArctostaphylos uva-ursi 'Green Supreme'moderate water, Central Valley2.67 gal/sq ft in JulyMassachusetts ManzanitaArctostaphylos uva-ursi 'Massachusetts'moderate water, Central Valley2.67 gal/sq ft in July

Similar plants that need less water 16

Rated lower than sweet violet in the Central Valley. Worth a look for a new bed or a lawn replacement.

BougainvilleaBougainvillea & spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyAgapanthusAgapanthus orientalislow water, Central Valley1.07 gal/sq ft in JulyGeraniumsPelargonium x hortorum and cvs.low water, Central Valley1.07 gal/sq ft in JulyLantanaLantana camara ssp. & cvs.low water, Central Valley1.07 gal/sq ft in JulySalviaSalvia greggii ssp., cvs. & hybridslow water, Central Valley1.07 gal/sq ft in JulyIrisesIris germanicalow water, Central Valley1.07 gal/sq ft in JulySucculentsEcheveria spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyJunipersJuniperus spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyRussian SagePerovskia spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyYarrowAchillea millefolium (non-native hybrids)low water, Central Valley1.07 gal/sq ft in JulyMountain AlyssumAlyssum montanumlow water, Central Valley1.07 gal/sq ft in JulySagebrushArtemisia spp. (shrubby)low water, Central Valley1.07 gal/sq ft in JulySilver SageSalvia argentealow water, Central Valley1.07 gal/sq ft in JulyPurple MulleinVerbascum phoeniceumlow water, Central Valley1.07 gal/sq ft in JulySilvery YarrowAchillea clavennaelow water, Central Valley1.07 gal/sq ft in JulyFern Leaf YarrowAchillea filipendulinalow water, Central Valley1.07 gal/sq ft in July
Minutes for your sprinklers

Turn this into minutes on your water days

Every city page has a calculator that takes sweet violet, your sprinkler type and the month, and gives the minutes per water day for that supplier's schedule. Or put it in a zone of the personal watering plan and get all twelve months printed.

Questions people ask

How often should I water sweet violet in summer?

In July, established sweet violet in loam needs a deep watering about every 8 days in the Central Valley, about every 11 days on the south coast and about every 5 days in the South Inland zone. Sandy soil holds less water, so waterings come closer together. Clay stretches them. Check the soil before each watering and skip one after a soaking rain.

How much water does sweet violet need per day?

In July in the Central Valley, established sweet violet needs about 0.3 gallons a day for a plant 2 feet across and about 1.1 gallons a day for a plant 4 feet across. Give it in deep waterings spread days apart rather than a little every day, so the whole root zone gets wet.

Does watering for sweet violet change across California?

Yes. WUCOLS rates sweet violet separately for each of the six California climate zones: moderate water in the North-Central Coastal zone, moderate water in the Central Valley zone, moderate water in the South Coastal zone, high water in the South Inland zone, not evaluated in the High and Intermediate Desert zone, not evaluated in the Low Desert zone. The monthly table above shows how the same rating translates into different gallon amounts as reference evapotranspiration changes.

Can sweet violet grow in full sun in California?

Partial shade or dappled light is a sound choice for sweet violet, especially in a hot garden. A struggling patch needs a check of both exposure and soil moisture. Choose moist, well-drained ground rather than trying to sustain an unsuitable sunny site with extra irrigation.

How do I stop sweet violet from spreading everywhere?

Established plants send out runners that root readily wherever they touch soil, so a patch can wander beyond its bed. Watch the bed edges as the runners extend into neighboring soil. Pull unwanted runners while they are small to keep the planting in bounds.

Why isn't my sweet violet flowering?

First consider the season: sweet violet normally flowers in late winter and spring. Check that the bed provides moist, draining soil and partial shade rather than assuming it needs fertilizer. Poor bloom alone does not identify a watering problem.

Does sweet violet need extra water in a hot inland garden?

South Inland has a high water rating for sweet violet, so give the root zone close attention there. Partial shade and moist, freely draining soil suit this plant. Keep any mulch clear of the crowns rather than piling it over the runners.

Can I grow sweet violet in the desert?

WUCOLS has not evaluated sweet violet for either desert region, so those entries do not establish suitability or water demand. Its documented growing preferences are partial shade and moist, well-drained soil. Seek local experience before choosing it for a desert planting.

More plant watering guides

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Sources