Roses are among the most beloved plants.  Matchless for their variety of colors and fragrance and forms, roses have a beauty that makes their persnickety nature part of their charm.  Roses need special pruning and fertilizing and insect prevention, but they also need strict attention to their fall and winter care. (Please note update at the end 5.3.2013)

Last year, I took some photos as I was preparing to overwinter my rose.  My ‘Double Delight’ tree rose is even more demanding with regard to its care than bush roses I also grow in pots.

Here is how I overwinter my tree rose:

Step 1:  Cease fertilizing roses 2 months before overwintering.  The first killing frosts in my area are mid-October so an August 15th deadline gives two full months for my roses to wind down and become convinced that it’s really OK with me for them to go dormant for the winter.

Roses, for all their complicated care, have a strong desire to grow even into the frosts.  No fertilizer, no pruning, and full exposure to cold temperatures/frosts tell them that they need to rest now.  While they’re in their two-month cool down, I dig a trench in my compost pile (which is more like a pile of leaves than a true compost pile).  The trench will need to be big enough to accommodate the tree rose laying on its side and whatever other roses I’ve been growing in pots.

Step 2:  Once the hard frosts have hit a time or two, I can safely prune them.  The leaves and flowers often have a dull purplish tone to them showing that they have been exposed to sufficient cold.  Roses already know it’s time to shut down for the season, so when I prune them for the winter’s covering, they just accept it and don’t rebel against it by trying to grow some more.  They are obedient roses.  Tree roses get pruned differently than a bush rose so my photos will demonstrate their winter care.

All non-landscape roses have a “graft union” (place where the pretty rose variety was plugged into the sturdy root stock).  For bush roses, it is located at the ground level and this graft union can be covered with soil or mulch.  I’m particular to pine bark mini-nuggets because they still pour when frozen and stay put during the winter.  The added benefit is the way they become part of the spring/summer mulch when I wash them away from the graft union.

Tree roses are different.  A standard form or tree rose has a root zone, a tall stalk that’s part of the rootstock, and the graft union is at the top of the root stock.  Since the graft union is what needs protecting, covering the roots with mulch does no good whatsoever for preserving the graft union.

The knotty looking section with stems coming out is called the graft union.  With bush roses, I’m content to leave the canes about 12-18 inches long.  Not so with tree roses.  I clip them back to about 3 inches from the graft union.  Otherwise the new growth in the spring will be long and so heavy that the weak juncture will break off easily.  So I try to keep the spring growth compact.  It begins in the fall as I cut away the dead canes completely and the green canes get clipped to approximately 3 inches in length.  I use sharp pruning shears that have been treated with bleach so I don’t contaminate the rose for its winter rest.

Step 3:  Once it is pruned, it looks very naked, I know.  But it will have less to try to maintain through the winter.  It may sound strange, but plants stay alive through the winter even as they are dormant.  If you have a large plant to try to keep alive, it will expend more of its stored food trying to keep it all alive…and it may end up killing the whole plant in the process.

You’ll notice I removed all the leaves which–at this point–will only be a source of disease inoculum for next year.  Even so, there may be some organisms on the canes, so I usually do one last spray of insecticide before wrapping it up.

Step 4:  Wrapping the rose for winter storage (left).

While I could just bury the rose in its pot, I prefer to take it out of the pot so rain and melting snow can keep the root zone hydrated.  Both the roots and the graft union need to be protected and with a long stalk, it risks being broken in addition to frozen.  Therefore, I take the extra step of wrapping it in frost cloth.  Both air and water can permeate it, but the rose will stay substantially cleaner and will make it less attractive for mice than if it were just buried among all the leaves.  Furthermore, wrapping the whole rose in frost cloth helps to make its removal in the spring less likely to break anything, whether the stalk or the graft union/new buds.

Step 5: Cover the wrapped tree rose in the trench with leaves.  Of course, the trench I’ve already prepared in the back and the neatly wrapped rose don’t look too good in the photo with both roots and graft union ready to be covered.  Should the police wonder what I’m burying, we could always open it to reveal nothing but the rose inside.  Last year my son had a few laughs at my expense as we went out and buried it.  But, I got the last laugh this spring when I unearthed it.

Step 6:  In the early spring, I unearth my tree rose and place it in a sheltered spot.  If it’s too cold outside still, I’ll put it in the garage.  I don’t want to leave it in the compost pile and have the leaf buds begin to “break” in the dark.  But I also don’t want to have gone through significant effort to overwinter it only to have it zapped by a late winter cold snap.  Unearthing it while it’s still dormant will allow it to develop naturally as the weather improves.  I pot it up, water it, and as the daylengths increase and the buds swell and break, I begin to fertilize it again.

My “Double Delight” tree rose began to experience bud break soon after unearthing/repotting it and it produced blossoms that were absolutely stunning this year.  By way of note, the stalk will not get taller.  The height you buy it is the height the standard (stalk portion) will remain.  The growth will be in the canes that arise from the graft union.  Bush roses can be grown in pots and overwintered the same way or planted in the ground (in their frost-proof pots) for the winter.  Landscape roses such as “Carefree Wonder”, many rugosa roses, “The Fairy”, drift or “Knockout” roses do not need this special care since they are hardier and not grown as grafted plants.  If you love roses but hate the maintenance, these “own root roses” are good options to try.

But for those of us who desire tree roses, we don’t mind that they are higher maintenance plants.  These jewels among jewels of the garden are well worth the extra care they require.   There is something marvelous about a reward of such beauty after a long labor of love.  It’s kind of a nice reflection in nature of the same beauty and reward of the Christian life well-lived. 

==== Important update (5.3.2013) For the first time in the decade I’ve been overwintering my roses this way, this year my roses were eaten by voles (a type of mouse).  Each of them looked like they had been put in an electric pencil sharpener and gnawed to a point.  I am attempting to root them (since there was remaining root stock below the graft union).  I’m not sure how well that will work since the bark appears to have been stripped all the way to the cambial layer, but I’ll keep you updated.

(2013) So this year when I overwinter my roses, it will include using hardware cloth (wire mesh with 1/4″ holes) to keep the voles from breaking my heart again next year.   As I wrap them in hardware cloth, I’ll include photos of that too.

That was ineffective as the voles found their way in, so last winter (2016-2017) I kept it in the garage.  I watered it periodically with cold water and kept the lights on in the garage to provide a little heat on the coldest of nights.  The result was a resounding success.  Cutting it back just as shown in the earlier photos, I placed it outside after danger of frost (putting it on the front porch tucked next to the house, if frost threatens).  Here is how it turned out.  It will be spectacular when it blooms.  I also did some containerized bush roses that way and they’re every bit as ready to burst into bloom! 

Hydrangeas can be confusing at nearly every season.   Fall confusion produces as many questions as spring confusion.

In the fall, people in the northern United States look at their hydrangeas and wonder, “Now what?”

Winter is coming. 

Do I cut my hydrangeas back? 

Do I let them go just as they are? 

Everyone has advice.  I’ll offer you mine and also point you to some really excellent web sites on hydrangeas (look for the links).

Most of the confusion can be resolved by knowing which hydrangea you have and where you live (check this hardiness zone map).  One web site that has a nice, easy-to-understand description has a Hydrangea Identification page.  It will help you to discern whether or not yours is:

1. a big leaf (H. macrophylla, also called Mophead or Lace Cap) which is commonly offered in various blue and pink forms and often can be color changed by altering soil pH.
2. oakleaf (H. quercifolia) which is native to the southeastern US,
3. Peegee (H. paniculata) which is native to Japan/China and has flowers that are elongated panicles rather than rounded,  or
4. “Annabelle’ type (H. arborescens) which have the large white ball-like flowers.  ‘Annabelle’ is the most famous of this class of hydrangea.

You’ll notice I listed them all as H. (which stands for Hydrangea) and then a different name second.  That’s because like a family all has the same last name and your first name distinguishes who in your family is being discussed, so the Latin second name refers to a specific species within a genus (the name Hydrangea).  How you care for hydrangeas depends on how hardy yours is and whether it characteristically blooms on old wood (last year’s growth) or new wood (current year’s growth).  In any case, I stop all fertilizing of hydrangeas and roses after August 15th to convince these plants to enter dormancy.

Among the ones that bloom on new wood are Endless Summer,  H. paniculata such as Limelight, and H. arborescens “Annabelle”.  Because these bloom on new wood, the current season’s growth, they can be pruned at any time, although late fall (after a few hard frosts) ensures they won’t try to continue putting out new growth and instead will enter dormancy.  Endless Summer will produce better/ more profuse blossoms if the spent flowers are removed.  If your Endless Summer are still smaller in size, you can just let them go through the winter, no pruning needed at all.  If yours are larger, you can prune them back, but it’s not necessary.  The grower has a nice winter care guide.    “Annabelle” is prized for its large white blossoms, but it can be cut down severely in the fall which helps it to maintain a better shape and sturdier habit for the following year (unless you prefer your Annabelle flowers bent over into your mulch, but frankly she deserves better than facedown in the dirt).

Old wood:  most of the other macrophylla (big leaf) and quercifolia (oak leaf) types must be pruned immediately after flowering as by fall, they’ve set their flower buds.  Lilacs, azaleas, rhododendrons, and many viburnums do the same thing.  Pruning these in the fall will cut off all the flower buds.  So how do I overwinter my macrophylla “Nikko Blue” and some so-called Color Change that aren’t actually hardy in my area?  I bought all of these knowing that they are marginally hardy and would die back down to their roots in Chicagoland.  I brought back my “Nikko Blue” from New Jersey many years ago as a sentimental family favorite and my “Color Change” were a carryover from some pots I’d planted at church.  I couldn’t bear to throw them out when I switched the pots to mums and winter evergreens and decided to give these hydrangeas a whirl in my garden.  The first year in the ground neither of these bloomed because they died too far back in the winter.  While hydrangea foliage is attractive enough, it misses the whole point of the beauty of the flowers!  I learned my lesson so now…

This is how I overwinter my marginally hardy macrophyllas:

Step 1:  I stake the area around my hydgrangea while the ground is not frozen (left).  But covering hydrangeas before they go dormant doesn’t help them.  Make sure that there have been a few hard frosts before continuing.

Step 2:  I surround my plant with rabbit fencing to create a corral (right) and begin to place the last of the fall leaves around the base of the plant as we get hard frosts.

Step 3:  I slowly and gently pile leaves from the center out to the tips of the plant to bend the stalks without breaking them (left).

Eventually the entire plant will be covered with a layer of leaves and I put some netting over the top to keep the leaves from blowing away during the winter.  Of course, this makes a mess for removal in the early spring time after the coldest of winter days have passed.  I remove the stakes, unwind the corral, and then the leaves used as cover slide easily from the center outward.  The leaves may be slimy and partly decomposed, but they’ve served their function of blanketing the stalks through the coldest winter days.

While this method has worked beautifully to have abundant flower buds survive a Chicagoland winter, it’s important to note that I remove the leaves before the buds “break” (start to unfurl) so that the leaves don’t rot and so the buds don’t send out tender new growth to get zapped by late frosts.  I keep my eyes on the forecast because after uncovering the bud-filled branches, I may need to cover them with frost cloth if we are due to dip below their hardiness.  Once the leaves are removed, the buds will need to adjust to the unsheltered conditions…just as they would in areas of the country where they are fully hardy.

In the spring, after I see where the strongest growth is maintained and where the deformed (damaged) buds begin, I prune the stalk into the strong growth section. This ensures that I will have the maximum number of flower buds, but not have the tips stunted by damaged growth.  It may seem like a lot of work to go through, but the reward is well worth it if you’re trying to grow certain macrophylla hydrangeas at the northern end of their hardiness.

The newer macrophylla varieties like Endless Summer have achieved great popularity because they have all the benefits of the beauty of the big leaf varieties without the hassle of overwintering.  They’re well worth the price in both beauty and hardiness.  But now, at least, you have an option to try if you’re trying to grow macrophyllas north of their normal hardiness.