Posted: 08/07/2014 at 20:47
You can overfeed , soil can replenish itself and what you may have done is raced your plants on, they are finished now. Please.... dont feed them, they are going into their rest period now, they will be twice this size next year, just leave them to rest..
Next year, grow some annual seeds, just to fill in the gaps, but you should find that they will spread from the roots and grow big.
Gardening is a long learning curve, take your time, dont give up.
The lupin looks very small to have been planted out, i like to get mine biggef in pots before planting out. They stand a better chance with slugs.