I've left avocado stones in water for way too long. What's the best way of making sure these survive when planted? Also what shop in UK sells cheap (and large 25+ cm Serpents Blue Chalk Fingers, Senecio vitalis 'Serpents', Monrovia Plant Amazon.com : Gardeners Basics Survival Vegetable Seeds Garden Kit Over 16,000 Seeds Non GMO and Heirloom, Great for Emergency Bugout Survival Gear 35 Varieties Seeds for Planting Vegetables 35 Free Plant Markers : Castor Bean Plant Seeds African Mother Tree 10 Seeds per Order Ardent Gardeners