Care notes for bulbs, corms, rhizomes, roots and tubers

GENERAL:
Corms, rhizomes, roots and tubers can be planted any time of the year just as flower bulbs can. Please remember that most have a growing season and will be dormant for 4-6 months of the year.
Depending on time of planting you may have to wait a few months for growth to appear.
Horseradish (Armoracia rusticana)
Horseradish is a member of the Cruciferae family (cabbage).
It originally comes from south-eastern Europe and Asia.
The plant is fully hardy in the UK and can be grown either for the roots to produce the famous horseradish sauce.
Or as a structural plant as the leaves can grow up to 4ft high.
The plant will be supplied (depending on time of year) as rooted thongs in summer and early autumn or dormant thongs in winter and spring.
On arrival dig a hole slightly larger than the thong and plant it with the pointy end down wards in the hole, they are planted vertically and grow like a parsnip to start with.
Horseradish has a hot flavour which is produced by essential oils including mustard oil, and also is high in vitamin C.
Growing season: March to October

Cannas
Cannas are best grown in a pot as they need to be kept inside over winter.
A large pot will help the plant grow large.
Plant the rhizome about an inch below the surface of the soil.
Multi purpose is fine for Cannas.
When the last frost has gone you can put the pot outside in full sun for the whole of summer.
In the wild cannas are marginal plants, so the soil must not dry out, best to keep on the moist to wet side.
Feed twice a week with tomato feed as instructed on the feed container.
At the end of summer wait for the first frost to blacken the leaves then move into a frost free greenhouse.
Cut of all the old leaves to soil level.
Don't water over winter.
The following year start to feed and water when the new leaves are starting to open.
Growing season: March to October

Rhubarb
Rhubarb is not fussy about the soil in which it is planted, as long as it does not get waterlogged in winter.
Pick an open site in full sun; rake in a general purpose fertiliser a couple of days before planting.
Keep the plants well watered and remove any flower stalks that appear.
Feed the plants with a general purpose fertiliser during the growing season.
Begin pulling the sticks from April on-wards but don't pull any after July as this may kill the plant.
Don't pull more than half the sticks or the plants will become weak.
Dispose of the leaves carefully as they are poisonous.
Growing season: March to July

Comfrey
Comfrey is a perennial relative of borage and is native to the UK; the roots supplied will vary depending on the time of year.
In season they will have growing points and out of season will be a thickest root.
If in season they look a bit limp on arrival, this is normal as they go weak when they are lifted, but after planting and watered well they recover in a few days, even if the leaves die down new ones will appear in a week or two.
Planting is the same all year.
Dig a hole about twice as deep as the root and lay it at a slight angle pointing down but with most of the root being horizontal.
New growth grows from the top and side of the root so the larger the top surface area the more shoots will appear.
Keep watered in dry weather in season.
Can be planted in the ground or in tubs, if planted in tubs they must be kept well watered until new growth is seen.
Growing season: April to September

Bulbs
Bulbs must be planted upon arrival.
As a general rule they are planted at 2-3 times their own depth. Depending on time of year they may take a year to flower.
Bluebell bulbs can take a couple of years to flower if planted at the wrong depth as they have special roots that will either raise or lower the bulb to get it to the correct depth.
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