Catharanthus roseus Periwinkle, Madagascar Periwinkle, Vinca

Catharanthus roseus Periwinkle, Madagascar Periwinkle, Vinca

Edward F. Gilman and Teresa Howe2

Introduction

Often known as Vinca rosea, Vinca multiflora, periwinkle grows 7- to 24-inches-high and broad, forming a mound of colourful flowers in white, pink, or rosy-purple on brittle stems (Fig. 1). Cultivars can be found with carpet-like or upright habits. Flowering is prolific all through the nice and cozy months, though crops might set up poorly in highly regarded climate. The plant tolerates warmth and flowers within the hottest climate, most likely higher than most different flowering floor covers. Spaced 12- to 20-inches-apart, crops will type a strong mass of mounded foliage and flowers 6- to 8-weeks after sowing seed, supplied they’re fertilized, watered flippantly (or in no way), and planted in full solar.


Determine 1. 

Periwinkle.


[Click thumbnail to enlarge.]

Basic Data

Scientific identify: Catharanthus roseus

Pronunciation: kath-uh-RANTH-us ROE-zee-us

Widespread identify(s): periwinkle, vinca, Madagascar periwinkle

Household: Apocynaceae

Plant kind: annual; perennial; herbaceous; floor cowl

USDA hardiness zones: 9B by 11 (Fig. 2)

Planting month for zone 7: Jun

Planting month for zone 8: Might; Jun

Planting month for zone 9: Apr; Might; Jun; Sep; Oct

Planting month for zone 10 and 11: Feb; Mar; Apr; Might; Sep; Oct; Nov; Dec

Origin: not native to North America

Makes use of: edging; floor cowl; mass planting; naturalizing; hanging basket; cascading down a wall; border

Availability: typically out there in lots of areas inside its hardiness vary


Determine 2. 

Shaded space represents potential planting vary.


[Click thumbnail to enlarge.]

Description

Peak: 1 to 2 toes

Unfold: 1 to 2 toes

Plant behavior: spherical

Plant density: reasonable

Development price: reasonable

Texture: medium

Foliage

Leaf association: reverse/subopposite

Leaf kind: easy

Leaf margin: complete

Leaf form: elliptic (oval)

Leaf venation: pinnate

Leaf kind and persistence: deciduous

Leaf blade size: 2 to four inches

Leaf colour: inexperienced

Fall colour: not relevant

Fall attribute: not relevant

Flower

Flower colour: pink; purple; lavender

Flower attribute: year-round flowering

Fruit

Fruit form: pod or pod-like

Fruit size: .5 to 1 inch

Fruit cowl: dry or exhausting

Texture: medium

Fruit colour: inexperienced

Fruit attribute: inconspicuous and never showy

Trunk and Branches

Trunk/bark/branches: not relevant

Present 12 months stem/twig colour: inexperienced

Present 12 months stem/twig thickness: medium

Tradition

Gentle requirement: plant grows partially shade/half solar

Soil tolerances: clay; sand; acidic; barely alkaline; loam

Drought tolerance: excessive

Soil salt tolerances: unknown

Plant spacing: 12 to 18 inches

Different

Roots: not relevant

Winter curiosity: plant has winter curiosity as a consequence of uncommon type, good persistent fruits, showy winter trunk, or winter flowers

Excellent plant: not significantly excellent

Invasive potential: might self-seed annually

Pest resistance: very delicate to a number of pests or ailments which might have an effect on plant well being or aesthetics

Use and Administration

Periwinkle will cascade over a wall or container and makes a pleasant hanging basket. Derivatives from periwinkle are utilized in a wide range of medicines and coverings for human illnesses together with leukemia and hodgkins illness. Crops seed themselves into the panorama.

The plant requires full solar and has an extended rising interval. Periwinkle likes to be stored on the dry facet and the roots will rot if irrigated too regularly. It’s best to not irrigate periwinkle greater than two or thrice after it’s planted. As soon as summer season rains start, crops usually succumb to root rot ailments from an excessive amount of water. A mattress of periwinkle seems to be nice till this time, but it surely ought to often be thought of a brief lived annual. A 3 month interval of colour with out illness is taken into account superb. As soon as crops are eliminated, plant with one other annual to complete the season. Some horticulturists have success rising periwinkle on a raised mattress comprised of sand or different very well-drained soil.

Propagation is by seed or cuttings. Softwood cuttings may be taken and rooted throughout summer season. The seed germinates in a single week at a temperature of 70°F to 75°F. Maintain the flat of seeds at midnight till the seed germinates and don’t overwater. Planting could also be executed at any time in the course of the 12 months in USDA hardiness zones 10 and 11.

There are a number of cultivars out there for flower colour and plant measurement. The ‘Carpet’ and ‘Little’ Sequence develop to not more than 12 inches tall. They too are delicate to root illness.

Pests and Illnesses

No pests are of main concern.

Root rots repeatedly trigger decay of roots and decrease stems.

Fusarium wilt may cause plant demise.

Blight causes brown or black spots which lengthen inward from the leaf edge and finally cowl the entire leaf. Area crops farther aside in subsequent plantings. Take away contaminated crops.

Canker and dieback trigger the shoot tip to turn into darkish brown, wilt, and die again to the soil floor. The illness is most typical throughout wet climate. Contaminated crops ought to be discarded.

A number of fungi trigger leaf spots on periwinkle however they’re often innocent.


U.S. Division of Agriculture, UF/IFAS Extension Service, College of Florida, IFAS, Florida A & M College Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.

Author: admin

Leave a Reply

Your email address will not be published. Required fields are marked *