When Yvonne Savio talks, savvy SoCal gardeners listen. And her message for fall is big: Despite a long tradition of planting during the “mild” days of September, her counsel this week is to put off any planting — even starting seeds — until late October or November, because folks, it’s just too darn hot these days, especially with the drought-induced restrictions on outdoor watering. … Even in the best of conditions, transplanting is a shock to any plant’s system, and that stress is much worse when it happens in high heat, even with plenty of water — and nobody in SoCal has plenty of water these days.