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Question:
Do pentas reseed themselves or do they need to be replanted every year?





Answer:
Pentas are treated as annuals since they are not cold hardy in your area. They are propagated from seed or cuttings. However, I have never experienced having them reseed themselves. Perhaps you could save some seed and see if you can get them to germinate next spring. But, I would plan on purchasing new plants if they are something that you wish to grow again. Or you could root some cuttings this summer and overwinter them in a protected location. The below information is from Botanica on CDRom:

Pentas lanceolata; Family name: Rubiaceae

Common name(s): Egyptian star, Star cluster

Synonym(s): Pentas carnea

This erect, straggling shrub grows to a height of 24 in (60 cm) and a spread of 3 ft (1 m). It is grown for the spring/summer appearance of its clusters of tubular, red, pink, lilac or white flowers, set among bright green, hairy leaves.

Hardiness zone from 10 To 12;
Plant Spread approx. 120 cm;
Plant Height approx. 60 cm;
Flowering colors: Mauve, Pink, Red, White;
Flowering season: Spring, Summer;
Garden type: Bedding Plant, Indoor Plant, Tropical, Container, Small Garden;
Position: Sunny, Semi-Shaded;
Propagation season: Spring, Summer;
Soil: Medium
Loam, Potting Mix.

Pentas Cultivation: Although very frost tender and only suitable for outdoor cultivation in very mild climates, they are easily grown as house plants and the new dwarf strains can be treated as bedding or pot annuals. Plant in moist, well-drained soil in full sun or part-shade and pinch back regularly to maintain a compact habit and to encourage bloom. Deadhead as required and trim lightly in early spring. Water generously when in full growth. Propagate from seed in spring or from softwood cuttings in summer. Watch for aphids and red spider mites.
 
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