Hello. Rose newbie here. What is a good fertilizer for newly planted roses?

Usually none until they begin to put on new growth.

Don't feed them until after the first bloom cycle. You can damage the forming roots.

I know this, because I did it.

Some questions. Where are you? At least what zone. What type of roses are we talking about? Were they bare root or potted when you bought them. Are they from a local nursery, big box store or mail order? All of that information is important to know to give you any kind of accurate advice.

FROM:
https://www.gardendesign.com/r...

HOW AND WHEN TO FERTILIZE ROSES
For Newly Planted Roses:

1. Amend the planting hole with rich organic matter.

2. Work in a slow-release fertilizer according to package instructions along with a handful of bone meal for healthy root development.

3. Sprinkle 1/4 to 1/2 cup of Epsom salts around the base of the plant to promote foliar and cane development.

I generally use a root boost liquid when I plant along with Number 1, although I follow no specific formulas.

Continue to fertilize every 3 to 4 weeks with a mild fertilizer such as fish emulsion. If a new plant dries out at all, full-strength fertilizers can cause leaf margins and root tips to burn.

I would test my water and soil before I added Epsom Salts (Magnesium sulfate).

We were taught to use it, and did so, until we learned that our water was already over-high in that. OOPS!

The truth is that we have folks here from all over the U.S., as well as some other countries. "Location, Location, Location" is good advice in gardening, as well as in real estate. What is good in some areas, is wrong in another.

jerijen said:
The truth is that we have folks here from all over the U.S., as well as some other countries. "Location, Location, Location" is good advice in gardening, as well as in real estate. What is good in some areas, is wrong in another.

I agree absolutely!

Arturo ( from another part of the world, although temperate, but very different!). Example I have to deal with too much drainage!

seilMI said:Some questions. Where are you? At least what zone. What type of roses are we talking about? Were they bare root or potted when you bought them. Are they from a local nursery, big box store or mail order? All of that information is important to know to give you any kind of accurate advice.

I have bought some bare root roses from Menard's and Home Depot and they were darn near literally bare root, singular, roses.
Those are the only ones I ever had problems with.

My point is that you can't treat a dormant bare root rose the same way you would treat a growing potted nursery rose when you first plant them. They have different needs.