what is the ideal npk + mineral supplement for rose in different phase?

Question

PB

what is the ideal npk + mineral supplement for rose in different phase?

by

Phuong Bui

8 years ago

4

Hi,

May I know what is the ideal NPK ration + mineral supplement I should provide for rose in those phase:

Right after a flush

During the flush to keep the flower longer

Before a flush to help the bloom get the maximum size?

To encourage new growth?

Michael Marriott · Answer 1 · 16th September 2016, 15:22:29

Hello Phuong Bai, sorry about the delay in replying I always prefer to give roses and indeed any plants in the garden a fertiliser that lasts a long time - at least 6-8 weeks which means one that is either organic or at least organically based. which means there is not much scope in changing the analysis. The fertiliser we recommend over here for roses in the ground has the analysis 9.5, 7.5, 10 and along with 3% Mg and micronutrients. This works very well also for the roses in our big pots, we apply it twice, in April and again in June although in a warmer climate you should apply it more often it is important though not to allow the P and K levels to get too high as this can create a serious imbalance that will lead to very poor growth. Depending on how cold your winters are you should limit the amount of N that is applied late in the season as this can encourage soft growth that will be more susceptible to winter damage Also high N feeds will encourage soft sappy growth that will be less strong and more susceptible to pests and diseases. Although it may well encourage larger flowers. I hope this helps Michael

Phuong Bui · Answer 2 · 19th September 2016, 04:32:13

Thanks alot Michael. I'm base in South East Asia so it's eternal summer here, lowest temp is 24 in few weeks a year. A DA rose can reach up to 2-3 meters easily with no winter pruning of die back. Hence I'm so confused when I refer to online source, as no winter break to adjust the feed. Also the pot mix we use here is very porous, Do you think it's safe to feed once a month with daily watering? I'm just afraid of the wash out from watering. On a side note, I wish you could design the course more about taking care of rose. Since many of us growing roses in pot, we don't have much use for the landscaping yet. Once our need arise, we can always come back for a specific course about that.

Michael Marriott · Answer 3 · 19th September 2016, 08:46:21

Good to hear more about where you are. Certainly growing roses in pots in your climate would be very different to growing them in the ground in the UK! It depends on what sort of fertiliser you use. One that is that is organically based will last much longer than an inorganically based one. So if the latter once a month may not be often enough. Liquid feeds are usually applied very frequently even once a week or even every watering as then the plant has a constant supply of nutrients rather than an erratic one. What does it suggest on the packet? If your pot mix is very porous then a more frequent feeding is likely to be more appropriate. Is there a less porous pot mix available so that then you don't have to water so often? the best way to tell is by looking at the leaves - do they look a good shade of green or are they pale or perhaps the veins are darker or lighter? As to the course contents I will consider it although a whole course on looking after roses might be a challenge although perhaps more on growing roses in pots might be valuable Michael

Phuong Bui · Answer 4 · 20th September 2016, 03:15:31

Thanks for taking time with my questions. Where I am, people believe in chemical fertilizer and they usually use a very high ration of NPK, such as from 20 up, for both N & P. For the high N, Is there any relation between high N & rose proliferation? I am trying to use up to 90% organic fertilizer like bloodmeal, neem, cotton seed etc etc but getting them where I am is tough. Paying a lot from US actually. I'm also using cow manure and bat shit ( not sure if it's appropriate word). And I'm so frustrated since despite my best effort, my roses are all healthy, vigorous, tall, thick cane, regular dead heading and the flowers are not that breathtaking. Such as not big enough, last long enough, or vivid color enough comparing to people who use chemical fertilizer. This is not a whining, I'm really interested in knowing the key for rose via fertilizer. And of course, I'm comparing to roses are growing in same areas, same age, same type. In general, I'm familiar with deficiency such as iron and such. So I'm giving a small dose of iron chelate once a month, and that cure many of them in deficiency when they first come to my garden. Regarding porous mix, black cane happens so often that we;re so scare of over watering, hence the porous mix. I'm going to put a new question for that soon. Looking forward to a new course !

what is the ideal npk + mineral supplement for rose in different phase?

what is the ideal npk + mineral supplement for rose in different phase?

Phuong Bui

Register to answer this question

Awards & Accreditations