The Yellow Farmhouse Garden

September 5, 2019

Be careful not to introduce invasive plants into your garden

 

It’s surprisingly easy to introduce an invasive plant into your garden. It often happens when gardeners share plants with one another.

We have a few examples of that happening in our garden. One of those is Pinellia tripartita a plant native to China and Japan. I’ve heard it called Japanese jack-in-the-pulpit, although there’s another plant goes by the same name. Crow dipper is another name. One website refers to it as green dragon, another calls it voodoo lily. Botanically speaking, it’s closely related to our native jack-in-the-pulpit.

Pinellia is a smallish plant only eight to twelve inches tall and can grow in a variety of environments as long as the soil is well-drained. In our garden it is growing as a weed in full sun. Actually, it is growing in the shade of taller sun-loving plants, it is flourishing under the peonies that we brought in from another garden.

It was present as a persistent weed in that original garden too. We thought we were very careful to remove any trace of the Pinellia when we dug the peonies – apparently that was not the case. Now six years later we are still fighting it.

Unlike the other weeds we’ve accidentally brought in, these we have been able to keep confined to one relatively small spot in our garden.

Pinellia is very well adapted for reproducing itself and is quite competitive growing among other plants. It produces both tubers and numerous seeds, making it doubly sure it will reproduce one way or another.

You can see the small tuber growing on the root. Each piece of plant will have at least one.

You can see the small tuber growing on the root. Each piece of plant will have at least one.

This past week we re-dug the peonies along with the infested soil they were growing in. The peonies we saved and replanted; the soil we bagged up and set it out for disposal in the landfill. Home composting will not destroy all of the seeds or tubers.

In some parts of the country people are planting it as an ornamental, it really is an unusual looking plant. Either it behaves itself in certain climates or it hasn’t become a big enough problem in those areas. People on gardening chat sites marvel how well it spreads without any effort on their part. In some states it is officially classified as a noxious weed.

Even though you can find reputable plant sources online extolling its virtues, I highly recommend against planting it. People say, “I’m a conscientious gardener and would never let it get out of control”. That may be the case but what happens if you move and sell your house, would the new owners be as vigilant?

There is a purple cultivar of Pinellia tripartita that is supposed to be non-invasive, I would never take a chance on that one either.

Bob

 

 

June 6, 2019

Prune off faded lilac flowers now

Filed under: Flowers,Shrubs — bob @ 9:43 am

Many of the lilacs I’ve seen have put on a nice show of flowers this spring. Some could have been even better if their owners had removed the spent flowers last spring.

Not many people are aware that deadheading lilacs is the best thing you can do for them to stimulate better flowers next year.

I don’t fault those who didn’t get around to doing that last year. If you remember, we had a wet spring last year and in the rush to get things planted, lilac deadheading was pushed far down on the list of gardening priorities.

Several years ago I was responsible for a dozen or more lilacs. My helpers and I always took the time to take off those spent blossoms and it really paid off. It’s another one of those delayed gratification things that gardeners always seem to be dealing with.

The ideal time to dead head lilacs is right after blossoming.

The ideal time to dead head lilacs is right after blossoming.

Deadheading is very easy work if you have a sharp pair of pruners. Just snip off the expired flower right at its base and let it fall. It can be time consuming on a large bush but after a bit you fall into a rhythm. To me it’s a satisfying job because you can see the old flowers accumulate on the ground as you work at it.  Plus you are aware that next year’s flowers will will be even showier.

Old lilac flowers never fall off. Instead their panicles turn brown as seeds begin to form making the shrub look messy. So taking off the old flowers also keeps your shrub looking nice and neat. To do the most good, deadhead before the seeds set. I like to do it just as the last of the flower color is left.

Don’t worry too much if can’t get around to snipping off the flowers, your lilac will still do fine without any attention. In addition to its reliable flowering habit, low maintenance is another reason why lilacs have remained popular since colonial times.

Lastly, a light application of fertilizer after deadheading will give your lilac the nutrients it needs to regrow its flowers buds.

Bob

May 30, 2019

Epsom salts for better roses

In order to grow  and flourish all plants, including roses, require basically the same nutrients. One is carbon which is supplied to the plant by carbon dioxide in the air. Another, even though we may not think of it as a nutrient, is water.

In the soil, there are three primary nutrients that plants use in large quantities: nitrogen (N), phosphorus (P) and potassium (K). Together the primary nutrients are known as NPK. Good garden soil usually contains much of the required NPK . But sometimes soil is low in one or more of the primary nutrients so we supplement it with either organic or conventional fertilizers.

Secondary nutrients are need but in far less concentrations. They include calcium, magnesium and sulfur.

A long time ago rose growers noticed, even though roses were growing in very fertile soil, sometimes their blossoms still weren’t as nice as roses in other gardens. After much trial and error they found by adding Epsom salts, roses blooms would be noticeably improved. The missing ingredient was magnesium supplied by magnesium sulfate, more commonly known as Epsom salts.

The same Epsom salts you use in your bathwater can be used for your roses.

The same Epsom salts you use in your bathwater can be used for your roses.

There are other sources of magnesium but some of them like dolomitic limestone can raise the soil pH. That would cause problems if your soil pH was already on the high side.

Add Epsom salts at the beginning of the growing season. For each mature rose bush apply a half cup of Epsom salts to the soil around the bush. You can do this either in dry form and water it in or dissolve it in water and apply as a solution. Do this every year to replace any magnesium used by the plant or leached out of the soil.

Bob

 

March 8, 2019

Checking stored flower tubers

Several weeks ago I blogged about how I store dahlias. Did you keep some of yours too? If you haven’t already done so, now’s the time to check on them to see how they’re doing. Serious dahlia growers begin planting their tubers in mid-March, in pots and in a greenhouse of course.

I opened mine up right after the polar vortex blew through a couple of weeks ago. They were in a spot that normally stays cool but never freezes. However, this fall I rearranged boxes and stuff in the garage. Without realizing it, doing that must have changed the airflow pattern and allowed cold air to settle in the spot where I stored my dahlia tubers. I didn’t have a thermometer in that area but I knew it got cold because the storage bags were partly frozen. That’s not a good sign.

They didn’t look too bad when I opened them up to take a peek, but some looked to be partly frozen. The outside layer of damp sawdust was lightly froze. Instead of warming the tubers up to thaw, I moved them to another more temperate part of the garage to slowly warm up. Today I finally brought them out to see how they were doing.

It's very easy to tell the damaged tubers from the undamaged.

It’s very easy to tell the damaged tubers from the undamaged. The one on the left was frozen.

As suspected, most of them were damaged beyond salvaging, I’m looking at about an eighty percent loss. The ones that survived look healthy though. I’ll re-pack the good ones in fresh sawdust and compost the rest.

I also had some elephant ears tubers in storage, those I kept in the pots that they grew in last summer. They look pretty good. I gave them a small amount of water whenever the soil looked really dry — maybe once every other week or so. In the spring I’ll knock them out of the pot, divide them and replant.

You can't see much in this photo but the elephant ear roots are looking good.

You can’t see much in this photo but the elephant ear roots are looking good.

Other large pots have cannas that I stored the same way as the elephant ears, right in the pots they grew. They got some water through the winter too but not as much as the elephant ears. I wanted to keep them a little on the dry side so they wouldn’t get water logged and rot. Remember, they are dormant and not growing so they don’t really need much water. On the other hand you don’t want them to dry out and shrivel up. It’s something you have to learn trough experience. I usually ere on the side of less water.

The canna bulbs are in fine shape at this point in time.

The canna bulbs are in fine shape at this point in time.

Unfortunately, we lost a large geranium to the cold. It was one that we’ve been saving and taking cutting from for years and years.  During the most recent warm-up, we set the potted plant out on the front porch and — you guessed it — forgot it was there and it froze overnight. There may be some dormant buds that survived, I’ll let you know how that turns out.

Bob

 

 

February 26, 2019

Forcing spring tree and shrub branches

We’re getting an early taste of spring at our house by forcing branches into bloom. It’s something gardeners have done for centuries ever since someone figured out if you cut some branches and bring them into a warm room during the winter, they will bloom.

When I was in elementary school, forcing pussy willow branches in the classroom during the winter was a regular thing. Do they still do that?
Right now we have willow branches blooming that Judy cut a couple of weeks ago. They’re not the large-budded pussy willows but they are still attractive. They just happened to be the ones growing in our yard.

Our willow branches have buds that range in color from light pink to yellow all on the same branch.

Our willow branches have buds that range in color from light pink to yellow all on the same branch.

In addition to willows, just about any kind of spring-blooming tree or shrub will work including, forsythias, vernal witch hazel, most fruit trees and many others.

In its simplest form , all you really do is cut off some branches and stick them in some water. You can improve the odds of getting better blooms by choosing branches that have more closely spaced buds — more buds means more flowers. Branches that are thicker than the average on the plant, work best too since they contain more of the nutrients the buds need to open and grow.

It's a lot of  fun watching the buds slowly progress through their development.

It’s a lot of fun watching the buds slowly progress through their development.

Cut the branches you want to force two to three feet long for best results. Once cut, remove all buds and side twigs that would be under water in your vase or other container.

Sometimes making a slit at the bottom of the stem will help it take up water more easily. Branches from lilacs and possibly other plants benefit from being lightly crushed at the bottom, best tool for that is a hammer. Just put the end of the branch on a scrap of wood and tap it until it is crushed.

Placing the entire branch in lukewarm water will help jump-start the process. The only big enough container we have to do that is the bath tub, plus there’s plenty of warm water handy right from the spout. A couple of hours in the tub will do it.

Change the water in the vase every couple of days or so to prevent mold and algae from growing and clogging up the water-conducting parts of the branch.

When forcing branches, keep in mind that not only are the flowers fun to see but the shape of the branch itself is also part of the arrangement. Don’t be tempted to cram too many branches into the vase or you may lose the pleasing design effect the branches add.

To extend your forcing season, cut new branches every week now until spring to have a fresh set of buds opening all the time.

Bob

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