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Hosta Care Articles

Hosta, Hosta, Hosta by Tony Avent


Nematode Problems?

If a plant becomes infected and it can be easily replaced you might want to destroy the entire plant. Spraying with Diazanon spray or hydrogen peroxide, (1/2 cup of 3% H2O2 per gallon used as a foliar drench can be effective at killing some nematodes but will not kill them all and should be repeated 2 or 3 times every 10 to 14 days. Orthene may reduce the active nematode population by about 60%, but none of these chemical treatments kill the eggs. The best way to destroy nematodes and the eggs in an infected hosta is to soak the entire plant in a warm water bath. Soak for 10 minutes in a 120F warm water bath or 5 minutes in a 130F bath. After soaking, immediately rinse with cold water to stop the cooking process.
Roseanne Kaylor

Dividing Hostas

Shamelessly stolen from the internet http://hardyplants.com/Hosta1.html

The first plant, 'Francee', is three years old and is at the perfect stage for division, while the second, 'Colossal', is six years old and the crown is too crowded.

As a rule the larger and more dense the clump the less divisions that are possible. On fast growing Hosta, three or four year plants produce the largest and best divisions, while on slower growing plants like the 'tokudama' and 'Sieboldiana' types, old mature clumps that are eight or more years old produce the easiest and largest divisions.

Hostas dug and ready for washing

Our two clumps are ready for washing, note the hose end sprayer - this works well for cleaning the dirt off the crown and roots. Do not worry about damaging the roots with the jet of water- they are tough and can take the abuse.

Clean the dirt off of the top and then turn the clump onto its side and clean again; do this a number of times. It also helps to pull the roots up and off to the sides as you wash.

Personally, if I have the time, I take the clumps to the lake and swish them in the water while I am pulling each cluster of roots apart; the more dirt you get off the clump the easier it is to pull the divisions apart or to see where you need to make cuts.

The best tools I have found for the removal of Hosta clumps from the ground are the above fork with flat blades and a tiling spade. Dig around the clump, starting six inches from the base of the clump. Once you have cut a circle around the clump, pry the clump lose and pop it out of the ground. On very large clumps in heavy rocky soils or clay based soils it can be a chore.

Two pulled divisions

The dirt is washed off and I only lost one or two leaves. We want to keep as many leaves and as many roots as possible on our new divisions so that the plant will grow fast and become strong for next year.

Hosta can be divided any time of the year, but mid to late summer is best, because at this time of the year plants are actively growing new roots. After some practice, you can produce nice plants that do not even look like they have been divided.

If you divide in the spring before the eyes have completely expanded, expect to have smaller and shorter leaves if you have to use a knife and cut the crowns. If you can keep from cutting up the crowns you can expect good results with a nice balanced clump shape.

If you divide in late spring after the leaves are out most of the way - many times you will end up with clumps that look floppy the rest of the season or until new leaves grow if you choose to cut off the old leaves.

Three pulled divisions Here we have the 'Francee' clump semi-divided. On this clump, I have made all divisions by hand without the use of a knife.

The less cutting that you can do on your clumps, the better your divisions will look and grow.

The first step, after cleaning the dirt off of the roots, is to pull any easily removable stems from the crown.

After you have removed the easy divisions, wash the clump again and pull the clump in half. Keep pulling the different sections in half until you get to the number of stems per division you want. In most cases. I divide my Hosta for increase or to sell the next year- so I divide down to single stems and keep them well watered and fertilized with a mild foliar spray.

To remove a stem from the crown, use a back and forth pulling motion and not a side wise motion, work the stem back and forth until it comes loose or breaks from the crown. In the above picture, we see a nice large division on the right ready for potting up - it will have three or more eyes next spring. On those Hosta that are slower growing, like the large blues, a nice large well rooted single stemmed division like this one will give you a nice large mature single or double set of stems next year, with very large leaves.

The other two clumps I will divide more for multiplication purposes and half would be ready for selling and the other half will go back in the ground to grow out.

Hosta 'Colossal' root ball Here is our clump of Hosta 'Colossal'. Notice how tight the clump is growing - there is no way that this can be divided by hand.

PA nice sharp knife will have to be used. Spread the roots out so that you can located a place to make your cut. Remember that you want to keep as many roots and leaves as possible, so make your cuts through the crown but not into the roots. I start by cutting the crown in half. I do this by placing the knife in the center of the crown, as far away as I can be from any large stems.

Make the cut about half way through the crown and then see if you can pull it apart by hand; use the same back and forth pulling motion. If you can't pull it apart then make the cut deeper.

Two cut divisions Notice how I have tried to not cut any of the roots, also notice that no mater how well you wash - once you start making your divisions you will need to wash more.

If you are just making a division for a friend or another plant for a different place in the garden - these two pieces would make nice looking clumps next year the way they are now.

Five Divisions Made with a Knife I have made five divisions using the knife. Notice that some of the stems are cut in half and others do not have a balanced set of roots around them. This is the disadvantage of having to use the knife. Also note that we have less divisions. Both of the clumps started with around 20 stems.

From the 'Francee', I produced 20 divisions with ten large ones that were potted up for next year and ten that were planted back in the ground. All of them had a good set of balanced roots and will produce nice looking plants next year that will be much large than our replanted divisions.

From the 'Colossal', I produced five divisions for selling and five that needed to be replanted. Those I had to replant will be smaller next year.

Once you have your divisions, the next step is planting them. Do not let the roots dry out too much. If you can not plant them right away, place some moist dirt or peat moss on the roots and put them in a place out of direct sun light. If your roots dry a little bit before you get a chance to replant - soak them in a bucket of water with a small amount of fertilizer. Do not leave the plants in water for more than a day, the roots will begin to rot.

For divisions that you have produced by pulling them apart and which have a nice balanced root distribution - plant your divisions about 1 inch deep- spread the roots out and cover the stems until you cannot see any of the white portions at the base of the stems. Water them in well so that there are no large air pockets in the soil. Do not step on the soil around the plants - this will compact the soil.

If you had to use a knife and cut up the crown - plant the divisions around 1.5-2 inches deeper and water in well.

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Updated: June 9, 2015 16:25