Allamanda williamsii grow and care – shrub of the genus Allamanda also known as Allamanda cathartica williamsii, Allamanda williamsii perennial evergreen can grow as annual, used as ornamental fragrant plant, can grow in tropics mediterranean, subtropics or temperate climate 9+ as perennial and 7+ as annual.
Leaves color green in elliptic shape the leaves grow on whorls.
How to grow Allamanda williamsii growing and care: Frost free, well drain, rich soil, mulch
How to care: Fertilize once a year, add mulch to keep the soil moist, add humus and organic matter
What is the best way to start growing? Plant / Seed / Vegetative Reproduction – cutting
How to propagate: Propagation by cutting better to start in the spring or with temperature of 24-28C (75-83F), requirements: moist soil, high humidity, peat soil, hormone for root growth, highly recommend to use green house (or small plastic box with holes), possible also to start cutting by water but need also the same condition and to switch soil every few days
Is it necessary to graft or use vegetative reproduction? No, but easier start by cutting than from seeds although it’s not hard to start from seeds
Difficulties or problems when growing: Invasive and aggressive
Planting season: Spring (as annual) or as perennial in hardiness zone 9, spring to summer in hardiness zone 10, spring to autumn in hardiness zone 11, all year in hardiness zone 12+.
How to plant: Dig hole bigger than the roots ball, add to the hole: organic matter, dead leaves and humus put back some soil and mix it, after this cover, water it twice in the first day and every day for two weeks.
Pests and diseases: Aphids, meal bug, mites
Pruning season: Autumn / Winter (possible all the year)
How to prune: Just for design, dead stems, and better to prune that plant that all the branches will get sun or at least light (better for blooming)
Size of the plant: 4-6 m – 12-20 feet
Growth speed in optimal condition: Fast growing, when the plant young grow slowly
Water requirement: Average amount of water / Big amount of water
Light conditions in optimal condition for growing: Full Sun / Half Shade will bloom less
Is it possible to grow indoor as houseplant? No
Growing is also possible in a planter, flowerpot, containers: Yes, when grow in container, size 10-20 liter (2.5-5 gallon), average amount of water that needed, it’s to keep the soil moist and the water go out of the pot, when it’s grow as perennial every two years to switch soil, and prune part of the roots and the plants, soil rich with organic matter add fertilizer, can us in potting mix or peat soil with perlite or vermiculite.
Bloom season? Summer / Autumn
General information about the flower: Trumpet-bell shape with five outer petals and five inner petals, the inner petals little shredded in the edge, the flowers grow in cluster, flower color yellow
How to grow Allamanda williamsii from seeds
Sowing requirement: Moist soil, better when the temperature 21-26 (70-79F), sunny location
Saving seeds and care until sowing: Dry and dark location
Sowing season: Spring / Summer
Planting spacing: Better in different pots, direct in the place 3*3m (10*10 feet)
Depth of Sowing: 2-4cm (1-1.8 inches)
Conditions for seeds germinate: Moist soil, high humidity in sunny location
Watering requires for Seeds: Big amount of water and after germinate average amount of water
Germination time: 2-6 weeks
Condition of seedling: Full sun with regular watering