Don't listen to all the raspberries. You care for and have sensimilla with three weeks passing between each visit. Don't leave a beaten path to your plants, and you might have some this fall. Laughing at your idea about stealth care in todays climate is unhelpful. Its a point a view thing. Its better to have some in the fall then nothing. You mentioned ploymer water retaining crystals, they work and they are worm friendly. Earth worm castings are great, try and get a compost that has worm castings, compost and cocoons. Build your soil to hold water, and try and keep it organic, less empty cartons of 7-7-7 laying around. And be discrete about your location if no one knows its less likely anybody will visit your plants take them and go.