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The leaves become bitter and the plants begin to bolt as the stem elongates into a tall bloom stalk. Leaf lettuce varieties take about 40 days from seeding to harvest while head types may take 70 days. This is another reason the head types are more of a challenge. To get more from your garden space, consider interplanting your lettuce with slower maturing crops.
Growth Time. Caladium plants reach full size, up to 3 feet tall, in one season. The size of the plant and the leaves depend on the size of the tuber. Seeds take one to three months to germinate before the plant begins to grow. Grown from tubers, leaves usually emerge within three to four weeks.Caladiums do not begin to grow until the soil temperature reaches 70 F, so cooler soil will mean a longer wait for the plants to emerge.rowth Time. Caladium plants reach full size, up to 3 feet tall, in one season. The size of the plant and the leaves depend on the size of the tuber. Seeds take one to three months to germinate before the plant begins to grow. Grown from tubers, leaves usually emerge within three to four weeks.