Subtropicals such as Chinese elms, Ulmus parvifolia, have little if any dormancy requirements. In colder areas they drop their leaves, go dormant and act like deciduous trees.
Being a subtropical species Serissa have to be protected from temperatures below 7°C which means indoor cultivation is required in most areas of Europe and America for a good proportion of the year.
Tropical/Subtropical
Tropical and Subtropical bonsai trees are commonly grown indoors all year round. Some bonsai types include Ficus, Serissa, Fukien Tea, Brush Cherry, Bougainvillea, Dwarf Umbrella, and some Elms.
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It has a worldwide, although highly uneven, distribution in tropical and subtropical regions.
Frost, a tropical and subtropical species being exposed to frost
Poison, the bonsai is exposed to a poisonous chemical either in the soil or the air (directly onto the foliage).
The Dwarf Pomegranate is a subtropical deciduous tree that produces breathtaking orange/red trumpet-shaped flowers, which are then followed by tiny orange/red ornamental fruit.
Subtropical species that are tender but can tolerate some freezing must be protected from temperatures that will kill their small branches or roots.
The Adenium is a genus of flowering plants in the family Apocynaceae, containing a single species, Adenium obesum, also known as Sabi Star, Kudu or Desert-rose, and is native to tropical and subtropical eastern and southern Africa and Arabia.
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How To Choose The Right Soil For Your Bonsai Tree ...
- Junipers (certain tropical and subtropical varieties)
- Leptospermum
- Ligustrum (both the Chinese and Japanese privet)
- Lonicera nitida (Hedging Honeysuckle)
- Myrtus (Myrtle)
- Nandina domestica (Heavenly Bamboo)
- Olea (Olive) ...
Serissa originates from south east Asia and is therefore a subtropical species. It needs to be kept at temperatures of between 12 to 20oC ideally though some suggest it can survive outdoors above 7oC.
Tropical and subtropical varieties can not tolerate tempers below 40 - 50 degrees F. These plants can be left outside when the temperatures stay above this. Light inside the house should be by filtered sunlight from an east, south, or west window.
Bonsai Soil Mix for Tropical/Subtropical
Bonsai Soil Mix for Conifer and Deciduous
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You might also want to put your beginner bonsai trees inside the house during the winter season, especially if they are of the tropical or subtropical variety.
1 part sieved stone
1 part lava stone
1 part Turface
3 parts fine or coarse pine bark
Tropicals, subtropicals ...
The "Exposed Root" bonsai style. Bonsai where the roots are long and visible, found often on tropical and subtropical bonsai.
Nebari ...
Under no circumstances should any tree from an area of the world subject to 'Hard' winters, be kept indoors for more than a few days at a time. Always select species from subtropical areas if you wish to keep bonsai indoors.
This includes the broad range of woody plant material grown in the landscapes of southern United States in addition to subtropical and tropical species.
 See also: Plant, Species, Growing, Bonsai, Tree
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