WateringTimesWatering plan, $19
Solanum laxum (jasminoides), WUCOLS IV

How often to water potato vine in California

In July in the Central Valley, established potato vine 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. Potato vine is a fast-growing, twining vine from South America that quickly covers a trellis or fence, evergreen in mild climates. Clusters of fragrant, star-shaped white flowers bloom profusely, nearly year round where winters are mild. It is in the nightshade family, and all parts are highly poisonous. It grows in sun or light shade and tolerates cold to about 20 degrees F.

VineRated for 5 of 6 zones

How often to water potato vine, 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 potato vine 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 3 inches down at the base of the vine in summer means potato vine needs water
  • Leaves wilting at the tips in afternoon heat point to a dry root zone
  • Leaves dropping after a hard freeze point to cold damage
  • Yellowing leaves in soggy soil point to poor drainage

How to water it

  • Water deeply, then let the top couple of inches dry
  • Plant in full sun to light shade in fertile, well-drained soil
  • Train it on a trellis, fence or arbor
  • Prune in spring to control its size
  • Keep children and pets from chewing it

Through the seasons

Water a new vine regularly while it climbs. Established vines want moderate water through the warm months, with deeper soaks in inland heat. Flowers come nearly all year in mild areas, heaviest from summer to fall, and the vine stays evergreen where winters are mild. WUCOLS rates potato vine moderate water on the north-central coast, in the Central Valley, on the south coast, in South Inland and in the low desert. WUCOLS marks it as not suited to the high desert.

In pots

Potato vine grows well in a large container with a trellis, or spills from a window box. Use a fertile, well-drained mix. Water when the top inch or two dries, until it drains. In summer, check every couple of days, since a fast vine in a pot dries quickly. Empty the saucer. Prune in spring to keep it in bounds. In winter, water when the mix dries.

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
0.711.42.12.90.4JAN0.65FEB1.09MAR1.52APR2.08MAY2.48JUN2.67JUL2.39AUG1.8SEP1.18OCT0.56NOV0.34DEC0.711.42.12.90.4JFM1.52AMJ2.67JAS1.18OND
Gallons per square foot per month, Central Valley. Peak 2.67 in Jul, 17.11 a year.

Monthly water need by climate zone

Potato Vine: gallons per square foot per month, by WUCOLS climate zone

MonthN. CoastC. ValleyS. CoastS. InlandHi DesertLo Desert
Jan0.370.40.780.78–0.78
Feb0.530.650.810.87–0.93
Mar0.871.091.151.3–1.52
Apr1.181.521.41.61–1.95
May1.462.081.611.95–2.45
Jun1.612.481.742.29–2.79
Jul1.612.671.982.51–2.85
Aug1.492.391.862.33–2.6
Sep1.241.81.491.86–2.08
Oct0.871.181.151.33–1.49
Nov0.470.560.840.9–0.96
Dec0.310.340.650.68–0.68
Year1217.1115.518.41–21.08

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 potato vine. Plants that drink alike can share one valve and one schedule.

JasmineJasminum polyanthummoderate 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 JulyIvyHedera helixmoderate water, Central Valley2.67 gal/sq ft in JulyGrapevinesVitis vinifera ssp. & cvs.moderate water, Central Valley2.67 gal/sq ft in JulyClematisClematis & ssp., hybrids & cvs.moderate water, Central Valley2.67 gal/sq ft in JulyEvergreen ClematisClematis armandiimoderate water, Central Valley2.67 gal/sq ft in JulyWinter CreeperEuonymus fortunei radicansmoderate water, Central Valley2.67 gal/sq ft in JulyArabian JasmineJasminum sambacmoderate water, Central Valley2.67 gal/sq ft in JulyHyacinth BeanLablab purpureus (Dolichos lablab)moderate water, Central Valley2.67 gal/sq ft in JulyTrumpet HoneysuckleLonicera sempervirensmoderate water, Central Valley2.67 gal/sq ft in JulyPink Trumpet VinePodranea ricasolianamoderate water, Central Valley2.67 gal/sq ft in JulyItalian ClematisClematis viticellamoderate water, Central Valley2.67 gal/sq ft in JulyHopsHumulus lupulusmoderate water, Central Valley2.67 gal/sq ft in JulyBoston IvyParthenocissus tricuspidatamoderate water, Central Valley2.67 gal/sq ft in JulyVirginia CreeperParthenocissus quinquefolia ssp. & cvs.moderate water, Central Valley2.67 gal/sq ft in July

Similar plants that need less water 9

Rated lower than potato vine 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 JulyWisteriaWisteria spp. & cvs.low water, Central Valley1.07 gal/sq ft in JulyFlowering WoodbineLonicera periclymenumlow water, Central Valley1.07 gal/sq ft in JulyFleeceflowerFallopia baldschuanica (Polygonum aubertii)low water, Central Valley1.07 gal/sq ft in JulyCarolina JessamineGelsemium sempervirenslow water, Central Valley1.07 gal/sq ft in JulyCecile Brunner RoseRosa 'Cecile Brunner'low water, Central Valley1.07 gal/sq ft in JulyLady Banks RoseRosa banksiaelow water, Central Valley1.07 gal/sq ft in JulyRoger's Red GrapeVitis 'Roger's Red'low water, Central Valley1.07 gal/sq ft in JulyBlue Dawn Morning GloryIpomoea acuminatalow 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 potato vine, 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 potato vine in summer?

In July, established potato vine 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 9 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 potato vine need per day?

In July in the Central Valley, established potato vine 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 potato vine change across California?

Yes. WUCOLS rates potato vine 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, moderate water in the South Inland zone, not suited to this region in the High and Intermediate Desert zone, moderate water in the Low Desert zone. The monthly table above shows how the same rating translates into different gallon amounts as reference evapotranspiration changes.

Is potato vine poisonous?

Yes, it has high severity poison characteristics. It is in the nightshade family. Keep children and pets from eating it.

How fast does potato vine grow?

It grows fast and can quickly cover a trellis or fence, reaching 30 feet. Prune in spring to control size. Give it a strong support.

When does potato vine bloom?

In mild climates it can bloom almost year round, with the most flowers from summer to fall. The flowers are fragrant. Water steadily for more bloom.

Is potato vine frost hardy?

It tolerates cold to about 20 degrees F and stays evergreen in mild winters. Colder snaps may damage it. It usually regrows.

Can potato vine grow in shade?

It grows in sun or light shade. More sun means more flowers. Shade slows drying.

More plant watering guides

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Sources