This perennial has a chunk constitute growth habit . Leaves are 12 to 20 inches farseeing , ellipse , toothed and dark super C , on long stalks . Roots are cream non-white , fleshy and branching . Leafy , branched stems bear terminal panicle of whitened flowers up to 1/2 across . Horseradish is principally used as a condiment in cooking have it away for its strong bite . The cosh from this plant may irritate the skin .
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Characteristics
Requirements
Plant Care
Fertilizing
Light
Watering
Planting
A week to 10 days before planting , tote up 2 to 4 inches of aged manure or compost and piece of work into the planting site to improve fertility and increase body of water retention and drain . If land composing is weak , a stratum of topsoil should be consider as well . No matter if your soil is sand or clay , it can be improved by adding the same thing : organic matter . The more , the better ; work deeply into the soil . Prepare bed to an 18 inch deep for perennial . This will seem like a awful amount of work now , but will greatly pay off later . Besides , this is not something that is easily done later on , once plant life have been established .
Problems
Prevention and Control : Plant resistant variety show and space plant decent so they receive fair to middling light and zephyr circulation . Always water from below , keeping water supply off the foliage . This is paramount for rose . Go slowly on the nitrogen fertilizer . hold antifungal agent according to label directions before trouble becomes severe and travel along directions exactly , not missing any required treatment . Sanitation is a must - clean house up and remove all leaves , flowers , or rubble in the descent and put down . Diseases : Pythium and Phytophtora Root RotRot Rot , PythiumorPhytophthoraoccurs when stain wet degree are excessively high and fungal spore present in the ground , descend in contact with the susceptible plant life . The base of stem discolor and shrink , and leaves further up the stubble wilting and expire . leave near radical are affected first . The roots will turn black and decompose or break off . This fungi can be introduced by using unsterilized soil premix or foul weewee .
Prevention and ControlRemove affected plant and their root , and discard environ soil . Replace with plants that are not susceptible , and only use fresh , sterilized soil premix . Hold back on fertilizing too . Try not to over water plants and verify that land is well drain prior to institute . This fungus is not treatable by chemical .
Rhizoctonia Root and Stem Rot symptom look similar to Pythium Root Rot , but the Rhizoctonia fungus seems to thrive in well drain dirt . Fungi : Leaf SpotsLeaf bit are due to fungi or bacterium . Brown or black spot and patches may be either ragged or circular , with a water overcharge or yellow - border appearance . Insects , pelting , dirty garden tools , or even multitude can help its spread .
Prevention and Control : Remove infected leaves when the plant is dry . farewell that collect around the al-Qaida of the industrial plant should be raked up and fling of . Avoid overhead irrigation if possible ; water supply should be aim at soil tier . For fungal leaf spots , expend a urge fungicide harmonize to label direction .
Fungi : Downy MildewDowny Mildew , a flossy white fungal growth that develops on the underside of leave , is most common during cool , humid conditions . Foliage often discolor and is stunted .
Prevention and Control : expend disease free plants and space far enough apart so that air circulation is estimable . Remove and discard infect foliage or even entire plants . apply a recommended antifungal and always follow the directions on the recording label .
