I bought some plants from a grower three years ago and I let them grow on for three years. This year over half the plants haven't grown there has been no sign of life. Does this mean my plants are dead or do you think they might do something next year.
My Asparagus Hasn’t Grown
Certified GKH Gardening Expert
This article will help determine if the plants are still alive: https://www.gardeningknowhow.com/plant-problems/environmental/how-to-tell-if-a-plant-is-dead-and-how-to-recover-an-almost-dead-plant.htm
As for your sandy soil, this should be fixed to improve the growing conditions for your plants. Without adequate soil, your asparagus plants cannot thrive. This article will help with that: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/amending-sandy-soil.htm