Is it to late to prune roses they have new growth

It depends on the type of rose, there are a few tips about pruning roses - make sure secateurs are clean + sharp so no damage is done to new growth, + always prune to an outward facing bud this keeps a clear space, usage of feed is essential for a healthy growth.

You need to remember when it flowers,if it flowers at the early part of the year which is group 1 they need to be pruned after flowering, when new growth appears tie in to support and feed. Group 2 flower on last years growth in late spring early summer. Prune before new growth appears in early spring. Group 3 flower in summer + early autumn. Hope that may be of some use.

Pruning Knock Out Rose When Why and How


How and When to Prune Knock Out Roses Sand and Sisal


Pruning Knock Out Roses How To Trim Knock Out Roses

Late winter or early spring is the recommended pruning time.

hi.
not sure if this is what you are after.
Method 2 Winter and Early Spring Pruning

1. Wait until the second or third season of growth. ...
2. Prune the roses after the buds break dormancy. ...
3. Count on vigorous growth. ...
4. Pay attention to height, width, and air circulation. ...
5. Snip away overlapping canes. ...
6. Remove one-third of the growth.

4 Ways to Prune Knockout Roses - wikiHow

https://www.wikihow.com/Prune-Knockout-Roses.
when to prune knockout roses in zone 6 Google Search

I like to prune mine after every blooming, but I live in a climate where it blooms year round. I am not sure where you live, but if you have a cold winter, prune them heavily just before the spring growth season. Depending on where you live that could be anytime between January and April. If these are older established roses. Prune them back after each blooming during the growing season. You will get a lot of flowering this way.

The roses don't care about the time-of-day. They won't like it much at any time other than the end-of-winter (before spring growth). Give them some rose food to make them feel better after you clip them.

Suggest a concentrated feeding program with bone meal and maybe a little nitrogen. Work it in being careful of surface roots. If you are brave, prune it way down. If it works, nex year should show lots of sucker growth (take them off) and continue with feeding program, but don't overdo it. Most roses thrive on serious pruning and do better when the roots don't have to transport nutrients all the way up a trellis at the start of the season.

Why Prune Roses Encourage new growth and bloom Remove dead wood Improve air circulation Shape the plant Tools You'll Need By-pass Pruners Long-handled Loppers Thick Gloves (preferably long ones) Rose Pruning Basics Use clean, sharp tools Look at the overall plant, but begin pruning from the base of the plant. Prune to open the center of the plant to light and air circulation Make your cuts at a 45-degree angle, about 1/4 inch above a bud that is facing toward the outside of the plant. Make sure it is a clean cut (not ragged) Remove all broken, dead, dying or diseased wood (Any branches that look dry, shriveled or black. Cut until the inside of the cane is white.) Remove any weak or twiggy branches thinner than a pencil If cane borers are a problem in your area, seal the cut with a white glue, such as Elmer?s. Remove ****** growth below the graft. Remove any remaining foliage When to Prune Roses Timing is determined by the class of the rose plant and the zone in which it is growing. Most rose pruning is done in the spring, with the blooming of the forsythia as a signal to get moving. If you don't have forsythia, watch for when the leaf buds begin to swell on your rose plants, meaning the bumps on the canes get larger and reddish in color. Hybrid tea roses are the most particular about pruning. If you don't know what type of rose you have, watch the plant for a season. If it blooms on the new growth it sends out that growing season, prune while dormant or just about to break dormancy, as stated above. If it blooms early, on last year's canes, don't prune until after flowering.