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Purple Rhododendron Flower


Purple Rhododendron Flower

Rhododendron


Rhododendron is a large genus in the heath (Ericaceae) family. It is made up of 800 species, deciduous and evergreen plants, that differ from small ground covers to medium sized trees. While spread throughout most of the northern temperate regions and into the tropics, the East Asia is the center of the genus. The foliage can be of different types, starting from the deciduous azaleas’s rough hairy leaves of the to the Rhododendron Grande’s huge, paddle-sized, leathery leaves. The flowers, that start from late winter and have all the variety of colors except blue, sometimes they are loosely clustered but often crowded into conical heads called trusses. The genus can be divided into two main types depending on the presence or absence of leaf scales and these two types can be divided into many sections and subsections. There are a lot of different types of rhododendrons so gardeners can choose everything they want: rhododendrons, including those up to 15 ft (4.5 m) tall; alpine rhododendrons, that have small leaves, wiry stems, and clusters of tiny flowers; shrub tree rhododendrons, that have a single trunk and a large head of foliage; evergreen azaleas, which are low to tall bushes with semi persistent foliage and large light-textured flowers; deciduous azaleas, which are large bushes with flowers usually in different shades of purple,  yellow, red, or orange; and vireya rhododendrons, which are tender species from tropics which have funnel-shaped blooms and their flowering season is not fixed. Washington and West Virginia respect Rhododendron very much so Rhododendron is their floral emblem.


Top Tip

Providing their cultural requirements are met, rhododendrons require little maintenance or pruning. Simply removing spent flowers will maintain their beauty.

Cultivation


Rhododendrons need the same as most heath family plants: moist, humus rich, free draining soil. This is very important in order not to impede the development of their fine roots. Also, in order to avoid damaging the surface roots, use mulch rather than cultivation for weed control. Species can be raised from seed, or from half-hardened cuttings or layers.


This genus includes a wide range of deciduous and evergreen shrubby azaleas and rhododendrons that can be propagated in a variety of ways. Times vary for first flowering, from 2 - 5 years or more.


Cuttings


To root deciduous azaleas, take softwood nodal stem-tip cuttings when the new growth is only an inch or two long, often when the shrubs are still flowering. Apply hormone rooting compound. Cuttings arc susceptible to scorch, so shade heavily on bright, hot days. Placing cuttings under mist works well. Rooting takes 8 - 1 0 weeks. The greater the root growth before autumn the better, since overwintering small rooted cuttings of deciduous azaleas is notoriously difficult. Placing rooted cuttings under fluorescent lights to extend the day length in colder climates is beneficial. For evergreen azaleas and dwarf rhododendrons, nodal greenwood cuttings root more easily. Many of the evergreen, large flowered hybrids root best from semi ripe nodal cuttings. Remove the tips, reduce larger leaves by up to a half, wound, and apply hormone rooting compound. Provide bottom heat of 54 - 68 ° F (12 - 20 ° C) for best results. Rooting takes 10 - 15 weeks.


Seeds


Seeds from hand-pollinated plants often come true to type. Surface-sow the fine seeds, gathered from dry pods, onto sieved acidic (ericaceous) soil mix.


Name

Flower color

Blooming Season

Flower Fragrance

Plant Height

Plant Width

Hardiness Zone

Frost Tolerance

Rhododendron augustinii

Mauve-blue to purple

Mid-spring to summer

No

3-20ft
0.9-6m

2-10ft
0.6-3 m

6-9

Yes

Rhododendron impedilum

Violet to purple

Late spring to early summer

No

12 in
30 cm

12 in
30 cm

4-8

Yes

Rhododendron
schlippenbachii

White, pale pink

Late spring

No

15ft
4.5 m

15ft
4.5 m

4-8

Yes

Rhododendron,
Azaleodendron Hybrids

Mauve, pink, yellow, cream

Late spring to early summer

Yes

2-8ft
0.6-2.4 m

2-8ft
0.6-2.4 m

5-10

Yes

Rhododendron,
Ghent Azalea Hybrids

White, pink, red, orange, yellow

Spring

Yes

5-8ft
1.5-2.4 m

3-6ft
0.9-1.8 m

5-9

Yes

Rhododendron,
Hardy Medium Hybrids

Various

Spring

Varied

3-6ft
0.9-1.8m

2-8ft
0,6-2.4 m

3-9

Yes

Rhododendron,
Hardy Small Hybrids

Various

Spring

Varied

1-4ft
0.3-1.2 m

1-5ft
0.3-1.5 m

4-9

Yes

Rhododendron,
Hardy Tall Hybrids

Various

Winter to spring

Varied

6-35ft
0.3-3 m

5-17ft
1.5-5 m

4-9

Yes

Rhododendron,
Indica Azalea Hybrids

Various

Mid –to late spring

No

1-10 ft
0.3-3 m

1-12ft
0.3-3.5 m

8-11

Yes

Rhododendron, Knap Hill and Exbury Azalea Hybrids

Various

Spring

No

4-10ft
1.2-3 m

4-7ft
1.2-2m

5-9

Yes

Rhododendron,
Kurume Azalea Hybrids

Various

Spring

No

2-5ft
0.6-1.5 m

2-5ft
0.6-1.5 m

7-10

Yes

Rhododendron,
Mollis Hybrids

Orange, red, yellow, cream

Mid –spring to summer

No

5-8ft
1.5-2.4 m

3-7ft
0.9-2 m

5-9

Yes

Rhododendron, Occidental
Azalea Hybrids

White, pink

Late spring to early summer

Yes

6-10ft
1.8-3 m

6-10ft
1.8-3 m

6-10

Yes

Rhododendron, Rustica Flore Pleno Azalea Hybrids

White to red

Late spring to summer

Yes

6-10ft
1.8-3 m

4-6ft
1.2-1.8 m

5-9

Yes

Rhododendron,
Satsuki Azalea Hybrids

White, Pink, Purple, Red

Late spring to summer

No

1-3ft
0.3-0.9 m

2-4ft
0.6-1.2 m

7-11

Yes

Rhododendron,
Tender Hybrids

Various

Spring

Varies

3-17ft
0.9-5 m

3-12ft
0.9-3.5 m

9-10

Yes

Rhododendron, Vireya Hybrids

Various

Throughout the year

Varied

1-6ft
0.3-1.8 m

1-5 ft
0.3-1.5 m

9-12

Yes

Rhododendron,
Yak Hybrids

White, pink

Summer

No

1-6ft
0.3-1.8 m

2-6ft
0.6-1.8m

4-9

Yes