My raspberries no longer grow as tall as they used to-Help!

I have a wonderful thornless variety of raspberries that used to grow over 7 feet travel. They are a delicious high producing bush. Nowadays their new shoots are no longer as vigourous and nowhere near as tall as what they used to be. They have been in the same location for about 25 years.

  6 answers
  • Nancy Turner Nancy Turner on Dec 02, 2017
    Maybe they have a life expectancy that they have met. I would maybe consider adding a couple of new plants to see if they grow better. Perhaps the soil needs some amending or fertilizer to perk them up. Could your plants be too close together and that may have stunted them a little?
  • Caseyem11 Caseyem11 on Dec 02, 2017
    try pruning so that one third of the older canes are cut off at the ground. This well leave room for the new shoots. You should do this annually.
  • 27524803 27524803 on Dec 02, 2017
    Try cutting them back this winter and give them a really thick layer of rotted manure while they are resting for the winter... The nutrients will leech into the soil slowly... and remember that their roots spread out a bit from the "canopy" In the spring work as much of the manure into the soil as you can.
  • Susan Whalen Susan Whalen on Dec 02, 2017
    Cut down fruit-bearing vines every year. Gently work well-composted manure around the base to a foot out from the plants every spring. If you are nervous about working manure into the soil; make manure tea in a rain barrel and water with that. After 25 yrs. your vines likely need rich soil to replace all they have taken from the earth with their roots to make your heavenly berries! You'd do well to start a new bed. You might even share some plants with others by thinning out the beds by taking a clump every other foot and filling the hole with good garden soil!