Radish

Raphanus sativus L.

Order: Capparales

Family: Brassicaceae

Names:

Raphanus is from the Greek ra and phanomai meaning to quickly appear and refers to the rapid germination and growth of seedlings. This evolved to the Greek raphanos meaning easily reared and is the Greek name for radish. Sativus is Latin for sown or cultivated.
Radish

Other Names:

Long Radish - var. niger
Small Radish - var. radicula

Summary:

A vegetable with a red, swollen root.

Description:

Cotyledons:

Two. Conduplicate.

Leaves:

Stipules -
Petiole -
Blade - Bristly hairs.

Stems:

Bristly hairs.

Flower head:

Flowers:

Ovary -
Sepals - Erect, pouched at the base.
Petals - Egg shaped, veined, with a long claw.
Stamens -
Anthers -

Fruit:

Inflated, smooth, thick, long, cylindrical, spongy walled, pith filled pod that is scarcely constricted between the seeds and does not break in segments. Long conical beak. Seeds not released from the pod.

Seeds:

Globular, pitted.

Roots:

Swollen taproot.

Key Characters:

Bristly hairs on the leaves and stems.
Swollen usually red root.
The fruit is inflated, smooth, thick, long, cylindrical, spongy walled, pith filled pod that is scarcely constricted between the seeds and does not break in segments.
The pod has a long conical beak.

Biology:

Life cycle:

Annual or biennial

Physiology:

Reproduction:

By seed.

Flowering times:

Seed Biology and Germination:

Vegetative Propagules:

Hybrids:

2 forms - Var. radicula the Small Radish has a globular or oblong root and var. niger the Long Radish has a long and often blackish swollen taproot.

Allelopathy:

Population Dynamics and Dispersal:

Spread mainly by intentional planting.

Origin and History:

Mediterranean. Western Asia.
Introduced as a vegetable crop.

Distribution:

NSW, QLD, SA, TAS, VIC.
Naturalised in NSW.

Courtesy Australia's Virtual Herbarium.

Habitats:

Climate:

Temperate.

Soil:

Friable soils.

Plant Associations:

Significance:

Beneficial:

Swollen root used as a salad vegetable.

Detrimental:

Toxicity:

Not recorded as toxic.

Legislation:

None.

Management and Control:

Thresholds:

Eradication strategies:

Not usually required.
Manually remove isolated plants.
Prevent seed set. Spray small infested areas with 10 g/ha Eclipse® plus 500mL/ha of Brodal® plus 1% spray oil in winter each year.
Most of the Brassicaceae weeds have dormant seeds that continue to germinate throughout the season and for several years. They often mature and set seed very quickly. Manual removal is effective but must be done at least every 8-10 weeks. Once pods are formed, seed will often mature even if the plant has been uprooted. Soil disturbance often leads to a flush of seedlings.
Many are somewhat unpalatable, so grazing only offers partial control. They often flourish in under-grazed, sunny areas.
In bushland situations, fairly selective control can be achieved with 100 mL spray oil plus 0.1 g Eclipse® or 0.5 g Logran® in 10 L water. 5 mL Brodal® is often added to this mix to provide residual control of seedlings. Spray the plants until just wet from the seedling stage up to pod formation.
Isolated plants should be removed manually and burnt if flowering or seeding and a 10 m buffer area sprayed with 10 mL Brodal® in 10 L water.
500 mL/ha of glyphosate(450g/L) can be used at flowering to reduce the seed set of most species on roadsides without causing significant damage to most native plants.
Wick application with 1 part glyphosate(450g/L) in 2 parts water or overall spraying with 100 mL glyphosate(450g/L) in 10 L water provides reasonable control of most Brassicaceae species though Wild Radish tends to regrow.

Herbicide resistance:

Biological Control:

Related plants:

Flax-leaf Alyssum (Alyssum linifolium)
Wall Cress (Arabidopsis thaliana)

Black Mustard (Brassica nigra)
Broccoli (Brassica oleracea var. italica)
Brussels Sprouts (Brassica oleracea var. gemmifera)
Cabbage (Brassica oleracea var. capitata)
Cauliflower (Brassica oleracea var. botrytis)
Chinese Cabbage (Brassica chinensis)
Indian Mustard (Brassica juncea)
Kale (Brassica oleracea var. acephala)
Kohlrabi (Brassica oleracea var. gongylodes)
Mediterranean Turnip (Brassica tournefortii)
Rape or Canola (Brassica napus var. napus)
Rapeseed (Brassica rapa var. sylvestris)
Savoy cabbage (Brassica oleracea var. sabauda)
Smooth Stemmed Turnip (Brassica barrelieri subsp. oxyrrhina was Brassica oxyrrhina)
Swede (Brassica napus var. napobrassica)
Turnip (Brassica rapa var. rapa)
Twiggy Turnip (Brassica fruticulosa)
Winter Rape (Brassica napus var. biennis)
Brassica elongata

Sea Rocket (Cakile maritima)
White Ball Mustard (Calepina irregularis)
Shepherd's Purse (Capsella bursa-pastoris)
Common Bittercress (Cardamine hirsuta)
Wood Bittercress (Cardamine flexuosa) is not in WA.
Ward's Weed (Carrichtera annua)
Wall Rocket (Diplotaxis muralis)
Sand Rocket (Diplotaxis tenuifolia)
Heliophila pusilla
Oval Purse (Hornungia procumbens was Hymenobolus procumbens)

Argentine Peppercress (Lepidium bonariense) is often found around granite rocks.
Common Peppercress (Lepidium africanum) is common in WA.
Field Cress (Lepidium campestre) has clasping stem leaves.
Garden Cress (Lepidium sativa)
Hoary Cress (Lepidium draba was Cardaria draba)
Lesser Swinecress (Lepidium didymum was Coronopus didymus)
Matted Peppercress (Lepidium pubescens)
Perennial Peppercress (Lepidium latifolium)
Virginian Peppercress (Lepidium virginicum)
(Lepidium oxytrichum)
(Lepidium perfoliatum)

Sweet Alyssum (Lobularia maritima)
Common Stock (Matthiola incana)
Night-scented Stock (Matthiola longipetala)
Muskweed (Myagrum perfoliatum) is not in WA.
Ball mustard (Neslia paniculata)

Cultivated Radish (Raphanus sativus).
Sea Radish (Raphanus maritimus).

Turnip Weed (Rapistrum rugosum)
Watercress (Rorippa nasturtium-aquaticum)
White Mustard (Sinapis alba) has white seed.
Charlock (Sinapis arvensis)

Sisymbrium altissimum is not in WA.
Smooth Mustard (Sisymbrium erysimoides)
London Rocket (Sisymbrium irio)
Hedge Mustard (Sisymbrium officinale)
Indian Hedge Mustard (Sisymbrium orientale)0
Sisymbrium runcinatum
African Turnip Weed (Sisymbrium thellungii) is not in WA.

Succowia balearica is in Kings Park in Perth.

Plants of similar appearance:

The native Brassicaceae species usually have short, broad and smooth pods.
Wild Radish (Raphanus raphanistrum). Seeds can be distinguished by seed coat characters 770.

References:

Auld, B.A. and Medd R.W. (1992). Weeds. An illustrated botanical guide to the weeds of Australia. (Inkata Press, Melbourne). P135.

Black, J.M. (1965). Flora of South Australia. (Government Printer, Adelaide, South Australia). P388.

Lazarides, M. and Hince, B. (1993). CSIRO handbook of economic plants of Australia. (CSIRO, Melbourne). #1044.3.

Acknowledgments:

Collated by HerbiGuide. Phone 08 98444064 or www.herbiguide.com.au for more information.