Tea roses are, as children from the China's, ideal for pot culture. Of course we can't expect that Teas, climbing Teas or Tea Noisettes will reach the same proportions or magnificence like their counterparts in the ground but the results are very satisfactory.
The Victorians often didn't have the mild winter temperatures of the Mediterranean or California or Australia so they were often forced to plant their Teas in pots so the plants could be brought indoors in conservatories or Orangeries. Often the Teas kept blooming during winter in these mild, bright structures.
Having read the writings or handbooks from the great Victorian rose connaisseurs I can certainly say that growing Teas in pots can be highly successful.
We need to pay attention to the medium they will get planted in. A good peat free potting compost will have to get mixed with a few handful of volcanic rock dust (Lavameel in Dutch). 2 parts of your potting soil needs to consist of good compost such as leaf compost or composted farm manure or mushroom compost. All is good as long as it's high in humus. Worm castings are also very useful.
What intrigued me was the active charcoal they used to mix in the mixture. Today this can be bought as "Biochar". A few handfuls of this material will enhance root quality immensely.
If you are planning to use bare root Tea roses for planting in pots you can treat the roots with mycorrhiza spores to give the roses an extra good start. Make sure to buy the mycorrhiza spores especially suited for roses.
I always use the "Rootgrow" brand and it's very good. If you're planting container roses in pots you can sprinkle some mycorrhiza spores in the bottom of the pots and place the rootball on top of them so the spores touch the roots.
Size of the pot is always important and if you're planning to grow your Teas at least 3 years in the pots a volume of at least 20 liters is a minimum and more is recommended.
Pots come in all kinds of materials but I prefer terracotta. Yes they are more expensive but they look as if they were made for the cause. They add to the beauty of the roses. Don't forget to cover the drainage hole with a piece of broken terracotta, this to ensure the hole won't get clogged and won't be able to drain excess water.
When I plant bare root Tea roses in pots I take my wheelbarrow and fill it up with a bag of 70 liters peat free potting compost. I add 20 liters of compost and in my case that's composted farm manure. 1 kg of Rock dust/flower goes in together with 5 liters of Biochar. Now I hustle it together till all is mixed well evenly. My potting medium is now ready to use...
Before planting bare root roses I always allow the roots to soak in a bucket of water for six to 12 hours.
Now I take my terracotta pot and put an old terracotta shard onto the drainage hole. I add some soil to cover the bottom and I take my rose. I inspect the roots, are they broken somewhere? Yes? Then I prune those away. Are they too long? Yes? Then again I shorten them a bit. When that's done I sprinkle them with the mycorrhiza and because the roots are wet the stuff glues on immediately. I grab the rose at the graft spot and I spread the roots evenly in the pot. Now I start to add my potting soil mixture while keeping the rose steady and in the middle. When you almost reach the graft spot you press down the soil a bit. Now you can add more soil till the graft is covered with 5 cm of soil. I then put a last layer of pure compost on top.
Now I need to water the rose. I always use rainwater because it doesn't contain calcium and this will prevent chlorosis or leaves turning light Green. Too much calcium blocks the plants ability to take in iron which results in an iron deficiency. It's clearly visible because the foliage turns light green and you can see the leaf nerves. So use rainwater if you have it. You add water to the pot till it drains away from the drainage hole. Now your rose is ready and you can put it in the spot of your choosing but remember that Teas love a sunny and warm spot.
Don't let your potted Teas dry out. In fall, winter and early spring you probably won't have to water the pots if they are kept in the garden. But checking them every two weeks can't hurt. When temperatures start to rise in April and May it's crucial to keep the pots moist. Never put watering plates underneath the pots. Roses hate wet feet and roots can start to rot very quickly. A good tip to use is the finger method: Stick your finger all the way into the soil of the pot. If it comes out moist you don't need to water the pot but if your finger comes out dry it's time to give water. How much? Till you see water draining from the bottom.
During late spring and summer it's really crucial to keep your pots well watered and to check your pots daily, yes daily!
In another Q&A we'll discuss feeding potted Tea roses.
Volcanic rock dust provides vital minerals and trace elements
Biochar is active charcoal which improves the soil
Mycorhizza will provide your Tea roses the best start